380 lines
14 KiB
C++
380 lines
14 KiB
C++
#include "./datetime.h"
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#include "../conversion/stringbuilder.h"
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#include "../conversion/stringconversion.h"
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#include <iomanip>
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#include <sstream>
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#include <stdexcept>
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#if defined(PLATFORM_UNIX)
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#include <time.h>
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#endif
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using namespace std;
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using namespace ChronoUtilities;
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using namespace ConversionUtilities;
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const int DateTime::m_daysPerYear = 365;
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const int DateTime::m_daysPer4Years = 1461;
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const int DateTime::m_daysPer100Years = 36524;
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const int DateTime::m_daysPer400Years = 146097;
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const int DateTime::m_daysTo1601 = 584388;
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const int DateTime::m_daysTo1899 = 693593;
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const int DateTime::m_daysTo10000 = 3652059;
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const int DateTime::m_daysToMonth365[13] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 };
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const int DateTime::m_daysToMonth366[13] = { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 };
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const int DateTime::m_daysInMonth365[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
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const int DateTime::m_daysInMonth366[12] = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
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template <typename num1, typename num2, typename num3> inline bool inRangeInclMax(num1 val, num2 min, num3 max)
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{
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return (val) >= (min) && (val) <= (max);
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}
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template <typename num1, typename num2, typename num3> inline bool inRangeExclMax(num1 val, num2 min, num3 max)
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{
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return (val) >= (min) && (val) < (max);
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}
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/*!
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* \class ChronoUtilities::DateTime
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* \brief Represents an instant in time, typically expressed as a date and time of day.
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* \remarks
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* - Time values are measured in 100-nanosecond units called ticks,
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* and a particular date is the number of ticks since 12:00 midnight, January 1,
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* 0001 A.D. (C.E.) in the GregorianCalendar calendar (excluding ticks that would
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* be added by leap seconds).
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* - There is no time zone information associated. Hence different time zones are
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* not taken into account when comparing two instances. For instance the
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* expression (DateTime::now() - DateTime::gmtNow()) returns one hour in Germany (instead of zero).
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*/
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/*!
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* \brief Constructs a new DateTime object with the local time from the specified UNIX \a timeStamp.
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*/
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DateTime DateTime::fromTimeStamp(time_t timeStamp)
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{
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if (timeStamp) {
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struct tm *timeinfo = localtime(&timeStamp);
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return DateTime::fromDateAndTime(timeinfo->tm_year + 1900, timeinfo->tm_mon + 1, timeinfo->tm_mday, timeinfo->tm_hour, timeinfo->tm_min,
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timeinfo->tm_sec < 60 ? timeinfo->tm_sec : 59, 0);
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} else {
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return DateTime();
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}
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}
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/*!
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* \brief Constructs a new DateTime object with the GMT time from the specified UNIX \a timeStamp.
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*/
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DateTime DateTime::fromTimeStampGmt(time_t timeStamp)
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{
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return DateTime(DateTime::unixEpochStart().totalTicks() + static_cast<uint64>(timeStamp) * TimeSpan::ticksPerSecond);
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}
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/*!
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* \brief Parses the given C-style string as DateTime.
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*/
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DateTime DateTime::fromString(const char *str)
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{
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int values[6] = { 0 };
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int *const dayIndex = values + 2;
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int *const secondsIndex = values + 5;
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int *valueIndex = values;
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int *const valuesEnd = values + 7;
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double miliSecondsFact = 100.0, miliSeconds = 0.0;
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for (const char *strIndex = str;; ++strIndex) {
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const char c = *strIndex;
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if (c <= '9' && c >= '0') {
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if (valueIndex > secondsIndex) {
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miliSeconds += (c - '0') * miliSecondsFact;
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miliSecondsFact /= 10;
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} else {
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*valueIndex *= 10;
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*valueIndex += c - '0';
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}
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} else if ((c == '-' || c == ':' || c == '/') || (c == '.' && (valueIndex == secondsIndex)) || (c == ' ' && (valueIndex == dayIndex))) {
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if (++valueIndex == valuesEnd) {
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break; // just ignore further values for now
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}
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} else if (c == '\0') {
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break;
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} else {
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throw ConversionException(argsToString("unexpected ", c));
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}
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}
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return DateTime::fromDateAndTime(values[0], values[1], *dayIndex, values[3], values[4], *secondsIndex, miliSeconds);
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}
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/*!
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* \brief Parses the specified ISO date time denotation provided as C-style string.
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* \returns Returns a pair where the first value is the parsed date time and the second value
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* a time span which can be subtracted from the first value to get the UTC time.
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* \remarks Not sure whether it is actually ISO conform, but it parses denotations like
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* "2016-08-29T21:32:31.588539814+02:00".
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*/
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std::pair<DateTime, TimeSpan> DateTime::fromIsoString(const char *str)
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{
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int values[9] = { 0 };
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int *const dayIndex = values + 2;
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int *const hourIndex = values + 3;
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int *const secondsIndex = values + 5;
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int *const miliSecondsIndex = values + 6;
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int *const deltaHourIndex = values + 7;
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int *valueIndex = values;
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bool deltaNegative = false;
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double miliSecondsFact = 100.0, miliSeconds = 0.0;
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for (const char *strIndex = str;; ++strIndex) {
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const char c = *strIndex;
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if (c <= '9' && c >= '0') {
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if (valueIndex == miliSecondsIndex) {
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miliSeconds += (c - '0') * miliSecondsFact;
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miliSecondsFact /= 10;
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} else {
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*valueIndex *= 10;
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*valueIndex += c - '0';
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}
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} else if (c == 'T') {
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if (++valueIndex != hourIndex) {
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throw ConversionException("\"T\" expected before hour");
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}
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} else if (c == '-') {
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if (valueIndex < dayIndex) {
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++valueIndex;
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} else {
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throw ConversionException("unexpected \"-\" after day");
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}
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} else if (c == '.') {
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if (valueIndex != secondsIndex) {
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throw ConversionException("unexpected \".\"");
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} else {
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++valueIndex;
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}
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} else if (c == ':') {
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if (valueIndex < hourIndex) {
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throw ConversionException("unexpected \":\" before hour");
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} else if (valueIndex == secondsIndex) {
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throw ConversionException("unexpected \":\" after second");
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} else {
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++valueIndex;
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}
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} else if ((c == '+') && (++valueIndex == deltaHourIndex)) {
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deltaNegative = false;
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} else if ((c == '-') && (++valueIndex == deltaHourIndex)) {
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deltaNegative = true;
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} else if (c == '\0') {
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break;
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} else {
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throw ConversionException(argsToString("unexpected \"", c, '\"'));
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}
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}
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deltaNegative && (*deltaHourIndex = -*deltaHourIndex);
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return make_pair(DateTime::fromDateAndTime(values[0], values[1], *dayIndex, *hourIndex, values[4], *secondsIndex, miliSeconds),
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TimeSpan::fromMinutes(*deltaHourIndex * 60 + values[8]));
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}
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/*!
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* \brief Returns the string representation of the current instance using the specified \a format.
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* \remarks If \a noMilliseconds is true the date will be rounded to full seconds.
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* \sa toIsoString() for ISO format
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*/
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string DateTime::toString(DateTimeOutputFormat format, bool noMilliseconds) const
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{
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string result;
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toString(result, format, noMilliseconds);
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return result;
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}
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/*!
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* \brief Returns the string representation of the current instance using the specified \a format.
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* \remarks If \a noMilliseconds is true the date will be rounded to full seconds.
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* \sa toIsoString() for ISO format
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*/
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void DateTime::toString(string &result, DateTimeOutputFormat format, bool noMilliseconds) const
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{
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stringstream s(stringstream::in | stringstream::out);
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s << setfill('0');
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if (format == DateTimeOutputFormat::DateTimeAndWeekday || format == DateTimeOutputFormat::DateTimeAndShortWeekday)
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s << printDayOfWeek(dayOfWeek(), format == DateTimeOutputFormat::DateTimeAndShortWeekday) << ' ';
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if (format == DateTimeOutputFormat::DateOnly || format == DateTimeOutputFormat::DateAndTime || format == DateTimeOutputFormat::DateTimeAndWeekday
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|| format == DateTimeOutputFormat::DateTimeAndShortWeekday)
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s << setw(4) << year() << '-' << setw(2) << month() << '-' << setw(2) << day();
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if (format == DateTimeOutputFormat::DateAndTime || format == DateTimeOutputFormat::DateTimeAndWeekday
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|| format == DateTimeOutputFormat::DateTimeAndShortWeekday)
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s << " ";
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if (format == DateTimeOutputFormat::TimeOnly || format == DateTimeOutputFormat::DateAndTime || format == DateTimeOutputFormat::DateTimeAndWeekday
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|| format == DateTimeOutputFormat::DateTimeAndShortWeekday) {
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s << setw(2) << hour() << ':' << setw(2) << minute() << ':' << setw(2) << second();
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int ms = millisecond();
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if (!noMilliseconds && ms > 0) {
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s << '.' << setw(3) << ms;
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}
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}
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result = s.str();
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}
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/*!
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* \brief Returns the string representation of the current instance in the ISO format,
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* eg. 2016-08-29T21:32:31.588539814+02:00.
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*/
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string DateTime::toIsoString(TimeSpan timeZoneDelta) const
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{
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stringstream s(stringstream::in | stringstream::out);
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s << setfill('0');
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s << setw(4) << year() << '-' << setw(2) << month() << '-' << setw(2) << day() << 'T' << setw(2) << hour() << ':' << setw(2) << minute() << ':'
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<< setw(2) << second() << '.' << setw(3) << millisecond();
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if (!timeZoneDelta.isNull()) {
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s << (timeZoneDelta.isNegative() ? '-' : '+');
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s << setw(2) << timeZoneDelta.hours() << ':' << setw(2) << timeZoneDelta.minutes();
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}
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return s.str();
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}
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/*!
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* \brief Returns the string representation as C-style string for the given day of week.
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*
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* If \a abbreviation is true, only the first three letters of the string will
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* be returned.
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* \sa DayOfWeek
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*/
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const char *DateTime::printDayOfWeek(DayOfWeek dayOfWeek, bool abbreviation)
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{
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if (abbreviation) {
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switch (dayOfWeek) {
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case DayOfWeek::Monday:
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return "Mon";
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case DayOfWeek::Tuesday:
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return "Tue";
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case DayOfWeek::Wednesday:
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return "Wed";
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case DayOfWeek::Thursday:
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return "Thu";
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case DayOfWeek::Friday:
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return "Fri";
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case DayOfWeek::Saturday:
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return "Sat";
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case DayOfWeek::Sunday:
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return "Sun";
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}
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} else {
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switch (dayOfWeek) {
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case DayOfWeek::Monday:
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return "Monday";
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case DayOfWeek::Tuesday:
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return "Tuesday";
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case DayOfWeek::Wednesday:
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return "Wednesday";
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case DayOfWeek::Thursday:
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return "Thursday";
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case DayOfWeek::Friday:
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return "Friday";
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case DayOfWeek::Saturday:
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return "Saturday";
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case DayOfWeek::Sunday:
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return "Sunday";
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}
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}
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return "";
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}
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#if defined(PLATFORM_UNIX)
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/*!
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* \brief Returns a DateTime object that is set to the current date and time on this computer, expressed as the GMT time.
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* \remarks
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*/
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DateTime DateTime::exactGmtNow()
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{
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struct timespec t;
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clock_gettime(CLOCK_REALTIME, &t);
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return DateTime(
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DateTime::unixEpochStart().totalTicks() + static_cast<uint64>(t.tv_sec) * TimeSpan::ticksPerSecond + static_cast<uint64>(t.tv_nsec) / 100);
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}
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#endif
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/*!
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* \brief Converts the given date expressed in \a year, \a month and \a day to ticks.
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*/
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uint64 DateTime::dateToTicks(int year, int month, int day)
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{
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if (inRangeInclMax(year, 1, 9999)) {
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if (inRangeInclMax(month, 1, 12)) {
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const int *daysToMonth = isLeapYear(year) ? m_daysToMonth366 : m_daysToMonth365;
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int passedMonth = month - 1;
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if (inRangeInclMax(day, 1, daysToMonth[month] - daysToMonth[passedMonth])) {
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int passedYears = year - 1;
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int passedDays = day - 1;
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return (passedYears * m_daysPerYear + passedYears / 4 - passedYears / 100 + passedYears / 400 + daysToMonth[passedMonth] + passedDays)
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* TimeSpan::ticksPerDay;
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} else {
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throw ConversionException("day is out of range");
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}
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} else {
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throw ConversionException("month is out of range");
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}
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} else {
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throw ConversionException("year is out of range");
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}
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return 0;
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}
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/*!
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* \brief Converts the given time expressed in \a hour, \a minute, \a second and \a millisecond to ticks.
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*/
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uint64 DateTime::timeToTicks(int hour, int minute, int second, double millisecond)
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{
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if (!inRangeExclMax(hour, 0, 24)) {
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throw ConversionException("hour is out of range");
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}
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if (!inRangeExclMax(minute, 0, 60)) {
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throw ConversionException("minute is out of range");
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}
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if (!inRangeExclMax(second, 0, 60)) {
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throw ConversionException("second is out of range");
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}
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if (!inRangeExclMax(millisecond, 0.0, 1000.0)) {
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throw ConversionException("millisecond is out of range");
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}
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return (hour * TimeSpan::ticksPerHour) + (minute * TimeSpan::ticksPerMinute) + (second * TimeSpan::ticksPerSecond)
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+ (uint64)(millisecond * (double)TimeSpan::ticksPerMillisecond);
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}
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/*!
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* \brief Returns the specified date part.
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* \sa DatePart
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*/
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int DateTime::getDatePart(DatePart part) const
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{
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int fullDays = m_ticks / TimeSpan::ticksPerDay;
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int full400YearBlocks = fullDays / m_daysPer400Years;
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int daysMinusFull400YearBlocks = fullDays - full400YearBlocks * m_daysPer400Years;
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int full100YearBlocks = daysMinusFull400YearBlocks / m_daysPer100Years;
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if (full100YearBlocks == 4) {
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full100YearBlocks = 3;
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}
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int daysMinusFull100YearBlocks = daysMinusFull400YearBlocks - full100YearBlocks * m_daysPer100Years;
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int full4YearBlocks = daysMinusFull100YearBlocks / m_daysPer4Years;
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int daysMinusFull4YearBlocks = daysMinusFull100YearBlocks - full4YearBlocks * m_daysPer4Years;
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int full1YearBlocks = daysMinusFull4YearBlocks / m_daysPerYear;
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if (full1YearBlocks == 4) {
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full1YearBlocks = 3;
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}
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if (part == DatePart::Year) {
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return full400YearBlocks * 400 + full100YearBlocks * 100 + full4YearBlocks * 4 + full1YearBlocks + 1;
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}
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int restDays = daysMinusFull4YearBlocks - full1YearBlocks * m_daysPerYear;
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if (part == DatePart::DayOfYear) { // day
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return restDays + 1;
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}
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const int *daysToMonth = (full1YearBlocks == 3 && (full4YearBlocks != 24 || full100YearBlocks == 3)) ? m_daysToMonth366 : m_daysToMonth365;
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int month = 1;
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while (restDays >= daysToMonth[month]) {
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++month;
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}
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if (part == DatePart::Month) {
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return month;
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} else if (part == DatePart::Day) {
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return restDays - daysToMonth[month - 1] + 1;
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}
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return 0;
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}
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