method

gmt_offset

v1_9_1_378 - Show latest stable - 0 notes - Class: Time

gmt_offset() public

Returns the offset in seconds between the timezone of time and UTC.

t = Time.gm(2000,1,1,20,15,1)   #=> 2000-01-01 20:15:01 UTC
t.gmt_offset                    #=> 0
l = t.getlocal                  #=> 2000-01-01 14:15:01 -0600
l.gmt_offset                    #=> -21600

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static VALUE
time_utc_offset(VALUE time)
{
    struct time_object *tobj;

    GetTimeval(time, tobj);
    if (tobj->tm_got == 0) {
        time_get_tm(time, tobj->gmt);
    }

    if (tobj->gmt == 1) {
        return INT2FIX(0);
    }
    else {
#if defined(HAVE_STRUCT_TM_TM_GMTOFF)
        return INT2NUM(tobj->tm.tm_gmtoff);
#else
        struct tm *u, *l;
        time_t t;
        long off;
        IF_HAVE_GMTIME_R(struct tm result);
        l = &tobj->tm;
        t = tobj->ts.tv_sec;
        u = GMTIME(&t, result);
        if (!u)
            rb_raise(rb_eArgError, "gmtime error");
        if (l->tm_year != u->tm_year)
            off = l->tm_year < u->tm_year ? -1 : 1;
        else if (l->tm_mon != u->tm_mon)
            off = l->tm_mon < u->tm_mon ? -1 : 1;
        else if (l->tm_mday != u->tm_mday)
            off = l->tm_mday < u->tm_mday ? -1 : 1;
        else
            off = 0;
        off = off * 24 + l->tm_hour - u->tm_hour;
        off = off * 60 + l->tm_min - u->tm_min;
        off = off * 60 + l->tm_sec - u->tm_sec;
        return LONG2FIX(off);
#endif
    }
}

gmt_offset

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