End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
Time#dst?
time.dst? → true or false
time.c
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static VALUE
time_isdst(VALUE time)
{
struct time_object *tobj;
GetTimeval(time, tobj);
MAKE_TM(time, tobj);
if (tobj->vtm.isdst == VTM_ISDST_INITVAL) {
rb_raise(rb_eRuntimeError, "isdst is not set yet");
}
return RBOOL(tobj->vtm.isdst);
}
Alias of #isdst
Returns true if time occurs during Daylight Saving Time in its time zone.
Example
# CST6CDT: Time.local(2000, 1, 1).zone #=> "CST" Time.local(2000, 1, 1).isdst #=> false Time.local(2000, 1, 1).dst? #=> false Time.local(2000, 7, 1).zone #=> "CDT" Time.local(2000, 7, 1).isdst #=> true Time.local(2000, 7, 1).dst? #=> true # Asia/Tokyo: Time.local(2000, 1, 1).zone #=> "JST" Time.local(2000, 1, 1).isdst #=> false Time.local(2000, 1, 1).dst? #=> false Time.local(2000, 7, 1).zone #=> "JST" Time.local(2000, 7, 1).isdst #=> false Time.local(2000, 7, 1).dst? #=> false