instance method

Time#isdst

() -> bool

dst? -> true or false

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);
}

Returns true if self is in daylight saving time, false otherwise:

Example

t = Time.local(2000, 1, 1) # => 2000-01-01 00:00:00 -0600
t.zone                     # => "Central Standard Time"
t.dst?                     # => false
t = Time.local(2000, 7, 1) # => 2000-07-01 00:00:00 -0500
t.zone                     # => "Central Daylight Time"
t.dst?                     # => true

See also #inspect #iso8601 #httpdate #localtime also in 4.1 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0

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