mktime.c

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#include <time.h>
 
#include "common/time_utils.h"
 
time_t mktime(struct tm* timePtr)
{
    if (!timePtr)
    {
        return (time_t)(-1);
    }
 
    _time_normalize(timePtr);
    _time_day_of_week(timePtr);
    _time_day_of_year(timePtr);
 
    int64_t totalDays = 0;
    int32_t year = timePtr->tm_year + 1900;
 
    for (int32_t y = 1970; y < year; y++)
    {
        totalDays += 365 + (_time_is_leap_year(y) ? 1 : 0);
    }
 
    totalDays += timePtr->tm_yday;
 
    time_t epochTime = (time_t)(totalDays * 86400LL + timePtr->tm_hour * 3600 + timePtr->tm_min * 60 + timePtr->tm_sec);
 
    if (timePtr->tm_isdst > 0)
    {
        epochTime -= 3600;
    }
 
    return epochTime;
}