c++ 'time_t' to 'yyyy mm dd', 'tm' to 'time_t' , example source code

 

refer to bloew example code:

..

//current day of second from 1900.01.01

    time_t current_time;

    current_time = time(NULL);

    printf("%ld seconds since January 1, 1900\n", current_time);

    //time_t to yyyy mm dd

    char buffer[80];

    strftime(buffer, 20, "%Y-%m-%d %H:%M:%S", localtime(&current_time));

    printf("%s", buffer);

    //make timt_t from custome yyyy mm dd

    struct tm s_tm = { 0 };

    s_tm.tm_year = 2022 - 1900;

    s_tm.tm_mon = 9 - 1;

    s_tm.tm_mday = 23;

    time_t s_tmt = mktime(&s_tm);

    printf("s_tmt %ld \n", s_tmt);

    /*

    struct tm {

        int tm_sec;         // seconds

        int tm_min;         // minutes

        int tm_hour;        // hours

        int tm_mday;        // day of the month

        int tm_mon;         // month

        int tm_year;        // year

        int tm_wday;        // day of the week

        int tm_yday;        // day in the year

        int tm_isdst;       // daylight saving time

    };

    */

..

Thank you.

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