loctotime.cpp File Reference

#include <corecrt_internal_time.h>

Include dependency graph for loctotime.cpp:

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Functions
template<typename TimeType >
static TimeType __cdecl	common_loctotime_t (int yr, int const mo, int const dy, int const hr, int const mn, int const sc, int const dstflag) throw ()
__time32_t __cdecl	__loctotime32_t (int const yr, int const mo, int const dy, int const hr, int const mn, int const sc, int const dstflag)
__time64_t __cdecl	__loctotime64_t (int const yr, int const mo, int const dy, int const hr, int const mn, int const sc, int const dstflag)

Function Documentation

__loctotime32_t()

__time32_t __cdecl __loctotime32_t	(	int const	yr,
		int const	mo,
		int const	dy,
		int const	hr,
		int const	mn,
		int const	sc,
		int const	dstflag
	)

Definition at line 93 of file loctotime.cpp.

{
    return common_loctotime_t<__time32_t>(yr, mo, dy, hr, mn, sc, dstflag);
}

Referenced by convert_system_time_to_time_t().

__loctotime64_t()

__time64_t __cdecl __loctotime64_t	(	int const	yr,
		int const	mo,
		int const	dy,
		int const	hr,
		int const	mn,
		int const	sc,
		int const	dstflag
	)

Definition at line 106 of file loctotime.cpp.

{
    return common_loctotime_t<__time64_t>(yr, mo, dy, hr, mn, sc, dstflag);
}

Referenced by convert_system_time_to_time_t().

common_loctotime_t()

template<typename TimeType >

static TimeType __cdecl common_loctotime_t ( int  yr, int const  mo, int const  dy, int const  hr, int const  mn, int const  sc, int const  dstflag  ) throw ( )

static

Definition at line 17 of file loctotime.cpp.

{
    typedef __crt_time_time_t_traits<TimeType> time_traits;
 
    static TimeType const invalid_time = static_cast<TimeType>(-1);
 
    // Adjust the absolute year to be an offset from the year 1900:
    yr -= 1900;
 
    _VALIDATE_RETURN_NOEXC(yr >= _BASE_YEAR && yr <= time_traits::max_year, EINVAL, invalid_time)
    _VALIDATE_RETURN_NOEXC(mo >= 1 && mo <= 12,                             EINVAL, invalid_time)
    _VALIDATE_RETURN_NOEXC(__crt_time_is_day_valid(yr, mo - 1, dy),         EINVAL, invalid_time)
    _VALIDATE_RETURN_NOEXC(hr >= 0 && hr <= 23,                             EINVAL, invalid_time)
    _VALIDATE_RETURN_NOEXC(mn >= 0 && mn <= 59,                             EINVAL, invalid_time)
    _VALIDATE_RETURN_NOEXC(sc >= 0 && sc <= 59,                             EINVAL, invalid_time)
 
    // Compute the number of elapsed days in the current year:
    int elapsed_days_this_year = dy + _days[mo - 1];
    if (__crt_time_is_leap_year(yr) && mo > 2)
        ++elapsed_days_this_year;
 
    TimeType const elapsed_years = static_cast<TimeType>(yr) - _BASE_YEAR;
    TimeType const elapsed_leap_years = static_cast<TimeType>(__crt_time_elapsed_leap_years(yr));
 
    // The number of elapsed days is the number of days in each completed year
    // since the epoch, plus one day per leap year, plus the number of days
    // elapsed so far this year:
    TimeType const elapsed_days = 
        elapsed_years * 365 +
        elapsed_leap_years +
        elapsed_days_this_year;
 
    TimeType const elapsed_hours   = elapsed_days    * 24 + hr;
    TimeType const elapsed_minutes = elapsed_hours   * 60 + mn;
    TimeType const elapsed_seconds = elapsed_minutes * 60 + sc;
 
    // Account for the time zone:
    __tzset();
 
    int  daylight = 0;
    long dstbias  = 0;
    long timezone = 0;
    _ERRCHECK(_get_daylight(&daylight));
    _ERRCHECK(_get_dstbias (&dstbias ));
    _ERRCHECK(_get_timezone(&timezone));
 
    TimeType const timezone_adjusted_seconds = elapsed_seconds + timezone;
 
    // Determine whether we are in Daylight Savings Time and adjust:
    TimeType const dst_adjusted_seconds = timezone_adjusted_seconds + dstbias;
 
    if (dstflag == 1)
        return dst_adjusted_seconds;
 
    tm tm_value;
    tm_value.tm_yday = elapsed_days_this_year;
    tm_value.tm_year = yr;
    tm_value.tm_mon  = mo - 1;
    tm_value.tm_hour = hr;
    tm_value.tm_min  = mn;
    tm_value.tm_sec  = sc;
    if (dstflag == -1 && daylight != 0 && _isindst(&tm_value))
        return dst_adjusted_seconds;
 
    // Otherwise, we are not in Daylight Savings Time:
    return timezone_adjusted_seconds;
}