calendar.h ~ calendar ~ make_datetime

constexpr datetime_type make_datetime(int year=1, int month=1, int day=1, int hour=0, int min=0, int sec=0, int milli=0, int utctz=0) noexcept;

Description

Initializes a valid ISO 8601 datetime_type structure.

Parameters

(Optional)

• year --> Year from 1 to 292277025
• month --> Month from 1 to 12
• day --> Day of month from 1 to 31
• hour --> Hour from 0 to 23
• min --> Minute from 0 to 59
• sec --> Second from 0 to 59
• milli --> Millisecond from 0 to 999
• utctz --> UTC time zone offset from -1800 to +1800

Return value

If the specified parameters represent a valid ISO 8601 date, returns a valid datetime_type object with all its members initialized, otherwise returns a default initialized datetime_type.

Exceptions

Never throws exception.

Examples

#include <iostream>
#include <JLC/JLC.h>
using namespace JLC;
using typename calendar::datetime_type;

int main(){
    constexpr datetime_type datetime = calendar::make_datetime(2012,12,12);
    std::cout << "Day of year = " << datetime.yday << std::endl;
    std::cout << "Week of year = " << datetime.yweek << std::endl;
}

Day of year = 347
Week of year = 50

See also

• ISO 8601
• UTC time zone
• calendar::datetime_type
• calendar::make_duration
• namespace calendar