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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118//// loctotime.cpp//// Copyright (c) Microsoft Corporation. All rights reserved.//// Defines the loctotime_t() family of functions, which convert a local time to// the internal time format (one of the time_t types).//#include <corecrt_internal_time.h>
// Converts a local time to a time_t value. Returns the time_t value on success;// returns a time_t with the value -1 and sets errno on failure. The 'dstflag'// is 1 for Daylight Time, 0 for Standard Time, and -1 if not specified.template <typename TimeType>static TimeType __cdecl common_loctotime_t( int yr, // Zero-based int const mo, // One-based int const dy, // One-based int const hr, int const mn, int const sc, int const dstflag ) throw(){ 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;}
extern "C" __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 ){ return common_loctotime_t<__time32_t>(yr, mo, dy, hr, mn, sc, dstflag);}
extern "C" __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 ){ return common_loctotime_t<__time64_t>(yr, mo, dy, hr, mn, sc, dstflag);}