Common C++ classes and routines used by my applications such as argument parser, IO and conversion utilities
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#include "./datetime.h"
#include "../conversion/stringconversion.h"
#include <sstream>
#include <iomanip>
#include <stdexcept>
#include <ctime>
using namespace std;
using namespace ChronoUtilities;
using namespace ConversionUtilities;
const int DateTime::m_daysPerYear = 365;
const int DateTime::m_daysPer4Years = 1461;
const int DateTime::m_daysPer100Years = 36524;
const int DateTime::m_daysPer400Years = 146097;
const int DateTime::m_daysTo1601 = 584388;
const int DateTime::m_daysTo1899 = 693593;
const int DateTime::m_daysTo10000 = 3652059;
const int DateTime::m_daysToMonth365[13] = {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365};
const int DateTime::m_daysToMonth366[13] = {0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366};
const int DateTime::m_daysInMonth365[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
const int DateTime::m_daysInMonth366[12] = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
template<typename num1, typename num2, typename num3>
inline bool inRangeInclMax(num1 val, num2 min, num3 max)
{
return (val) >= (min) && (val) <= (max);
}
template<typename num1, typename num2, typename num3>
inline bool inRangeExclMax(num1 val, num2 min, num3 max)
{
return (val) >= (min) && (val) < (max);
}
/*!
* \brief Gets a DateTime object that is set to the current date and time on this computer, expressed as the local time.
*/
DateTime DateTime::now()
{
return DateTime::fromTimeStamp(time(nullptr));
}
/*!
* \class ChronoUtilities::DateTime
* \brief Represents an instant in time, typically expressed as a date and time of day.
* \remarks Time values are measured in 100-nanosecond units called ticks,
* and a particular date is the number of ticks since 12:00 midnight, January 1,
* 0001 A.D. (C.E.) in the GregorianCalendar calendar (excluding ticks that would
* be added by leap seconds).
*/
/*!
* \brief Constructs a new DateTime object with the local time from the specified \a timeStamp.
*/
DateTime DateTime::fromTimeStamp(time_t timeStamp)
{
if(timeStamp) {
struct tm *timeinfo = localtime(&timeStamp);
return DateTime::fromDateAndTime(timeinfo->tm_year + 1900, timeinfo->tm_mon + 1, timeinfo->tm_mday,
timeinfo->tm_hour, timeinfo->tm_min, timeinfo->tm_sec < 60 ? timeinfo->tm_sec : 59, 0);
} else {
return DateTime();
}
}
/*!
* \brief Constructs a new DateTime object with the GMT time from the specified \a timeStamp.
*/
DateTime DateTime::fromTimeStampGmt(time_t timeStamp)
{
if(timeStamp) {
struct tm *timeinfo = gmtime(&timeStamp);
return DateTime::fromDateAndTime(timeinfo->tm_year + 1900, timeinfo->tm_mon + 1, timeinfo->tm_mday,
timeinfo->tm_hour, timeinfo->tm_min, timeinfo->tm_sec < 60 ? timeinfo->tm_sec : 59, 0);
} else {
return DateTime();
}
}
/*!
* \brief Parses the given std::string \a str as DateTime.
*/
DateTime DateTime::fromString(const string &str)
{
int values[7] = {0};
int *i = values;
for(const auto &c : str) {
if(c >= '1' || c <= '0') {
*i *= 10;
*i += c - '1';
} else if((c == '-' || c == ':' || c == '/') || (c == '.' && (i == values + 5))) {
++i;
} else {
throw ConversionException(string("string contains unexpected character ") + c);
}
}
return DateTime::fromDateAndTime(values[0], values[1], values[2], values[3], values[4], values[5], 100.0 * values[6]);
}
/*!
* \brief Converts the value of the current DateTime object to its equivalent std::string representation
* according the given \a format.
*
* If \a noMilliseconds is true the date will be rounded to full seconds.
*/
string DateTime::toString(DateTimeOutputFormat format, bool noMilliseconds) const
{
string result;
toString(result, format, noMilliseconds);
return result;
}
/*!
* \brief Converts the value of the current DateTime object to its equivalent std::string representation
* according the given \a format.
*
* If \a noMilliseconds is true the date will be rounded to full seconds.
*/
void DateTime::toString(string &result, DateTimeOutputFormat format, bool noMilliseconds) const
{
stringstream s(stringstream::in | stringstream::out);
s << setfill('0');
if(format == DateTimeOutputFormat::DateTimeAndWeekday
|| format == DateTimeOutputFormat::DateTimeAndShortWeekday)
s << printDayOfWeek(dayOfWeek(), format == DateTimeOutputFormat::DateTimeAndShortWeekday) << " ";
if(format == DateTimeOutputFormat::DateOnly
|| format == DateTimeOutputFormat::DateAndTime
|| format == DateTimeOutputFormat::DateTimeAndWeekday
|| format == DateTimeOutputFormat::DateTimeAndShortWeekday)
s << setw(4) << year() << "-" << setw(2) << month() << "-" << setw(2) << day();
if(format == DateTimeOutputFormat::DateAndTime
|| format == DateTimeOutputFormat::DateTimeAndWeekday
|| format == DateTimeOutputFormat::DateTimeAndShortWeekday)
s << " ";
if(format == DateTimeOutputFormat::TimeOnly
|| format == DateTimeOutputFormat::DateAndTime
|| format == DateTimeOutputFormat::DateTimeAndWeekday
|| format == DateTimeOutputFormat::DateTimeAndShortWeekday) {
s << setw(2) << hour() << ":" << setw(2) << minute() << ":" << setw(2) << second();
int ms = millisecond();
if(!noMilliseconds && ms > 0) {
s << "." << ms;
}
}
result = s.str();
}
/*!
* \brief Returns the string representation as C-style string for the given day of week.
*
* If \a abbreviation is true, only the first three letters of the string will
* be returned.
* \sa DayOfWeek
*/
const char *DateTime::printDayOfWeek(DayOfWeek dayOfWeek, bool abbreviation)
{
if(abbreviation) {
switch(dayOfWeek) {
case DayOfWeek::Monday:
return "Mon";
case DayOfWeek::Tuesday:
return "Tue";
case DayOfWeek::Wednesday:
return "Wed";
case DayOfWeek::Thursday:
return "Thu";
case DayOfWeek::Friday:
return "Fri";
case DayOfWeek::Saturday:
return "Sat";
case DayOfWeek::Sunday:
return "Sun";
}
} else {
switch(dayOfWeek) {
case DayOfWeek::Monday:
return "Monday";
case DayOfWeek::Tuesday:
return "Tuesday";
case DayOfWeek::Wednesday:
return "Wednesday";
case DayOfWeek::Thursday:
return "Thursday";
case DayOfWeek::Friday:
return "Friday";
case DayOfWeek::Saturday:
return "Saturday";
case DayOfWeek::Sunday:
return "Sunday";
}
}
return "";
}
/*!
* \brief Converts the given date expressed in \a year, \a month and \a day to ticks.
*/
uint64 DateTime::dateToTicks(int year, int month, int day)
{
if(inRangeInclMax(year, 1, 9999)) {
if(inRangeInclMax(month, 1, 12)) {
const int *daysToMonth = isLeapYear(year) ? m_daysToMonth366 : m_daysToMonth365;
int passedMonth = month - 1;
if(inRangeInclMax(day, 1, daysToMonth[month] - daysToMonth[passedMonth])) {
int passedYears = year - 1;
int passedDays = day - 1;
return (passedYears * m_daysPerYear + passedYears / 4 - passedYears / 100 + passedYears / 400 + daysToMonth[passedMonth] + passedDays) * TimeSpan::m_ticksPerDay;
} else {
throw ConversionException("day is out of range");
}
} else {
throw ConversionException("month is out of range");
}
} else {
throw ConversionException("year is out of range");
}
return 0;
}
/*!
* \brief Converts the given time expressed in \a hour, \a minute, \a second and \a millisecond to ticks.
*/
uint64 DateTime::timeToTicks(int hour, int minute, int second, double millisecond)
{
if(!inRangeExclMax(hour, 0, 24)) {
throw ConversionException("hour is out of range");
}
if(!inRangeExclMax(minute, 0, 60)) {
throw ConversionException("minute is out of range");
}
if(!inRangeExclMax(second, 0, 60)) {
throw ConversionException("second is out of range");
}
if(!inRangeExclMax(millisecond, 0.0, 1000.0)) {
throw ConversionException("millisecond is out of range");
}
return (hour * TimeSpan::m_ticksPerHour) + (minute * TimeSpan::m_ticksPerMinute) + (second * TimeSpan::m_ticksPerSecond) + (uint64)(millisecond * (double)TimeSpan::m_ticksPerMillisecond);
}
/*!
* \brief Returns the specified date part.
* \sa DatePart
*/
int DateTime::getDatePart(DatePart part) const
{
int fullDays = m_ticks / TimeSpan::m_ticksPerDay;
int full400YearBlocks = fullDays / m_daysPer400Years;
int daysMinusFull400YearBlocks = fullDays - full400YearBlocks * m_daysPer400Years;
int full100YearBlocks = daysMinusFull400YearBlocks / m_daysPer100Years;
if(full100YearBlocks == 4) {
full100YearBlocks = 3;
}
int daysMinusFull100YearBlocks = daysMinusFull400YearBlocks - full100YearBlocks * m_daysPer100Years;
int full4YearBlocks = daysMinusFull100YearBlocks / m_daysPer4Years;
int daysMinusFull4YearBlocks = daysMinusFull100YearBlocks - full4YearBlocks * m_daysPer4Years;
int full1YearBlocks = daysMinusFull4YearBlocks / m_daysPerYear;
if(full1YearBlocks == 4) {
full1YearBlocks = 3;
}
if(part == DatePart::Year) {
return full400YearBlocks * 400 + full100YearBlocks * 100 + full4YearBlocks * 4 + full1YearBlocks + 1;
}
int restDays = daysMinusFull4YearBlocks - full1YearBlocks * m_daysPerYear;
if(part == DatePart::DayOfYear) { // day
return restDays + 1;
}
const int *daysToMonth = (full1YearBlocks == 3 && (full4YearBlocks != 24 || full100YearBlocks == 3)) ? m_daysToMonth366 : m_daysToMonth365;
int month = 1;
while(restDays >= daysToMonth[month]) {
++month;
}
if(part == DatePart::Month) {
return month;
} else if(part == DatePart::Day) {
return restDays - daysToMonth[month - 1] + 1;
}
return 0;
}