day light saving

[Kowshik Nandagudi]

Hi

Can I know if my date falls in a dst? I dont want to specify the time but only the date

For example:

 Calendar cal  = Calendar.getInstance();
cal.set(2011,09,30); // October 30th falls in DST

[Claudiu Chelemen]

Hi

You may use the inDaylightTime method on the TimeZone

TimeZone.getDefault().inDaylightTime(cal.getTime())

Cheers,
Claudiu

[Kowshik Nandagudi]

@Test
		public void checkIfDateIsDST() throws Exception {
		TimeZone tz = TimeZone.getDefault();
		Calendar cal = Calendar.getInstance();
		cal.set(2011, 9, 30);
		System.out.println(cal.getTime().toString());
		System.out.println(tz.inDaylightTime(cal.getTime()));
	}

The above code returns false even though 30th october 2011 falls under DST

[Claudiu Chelemen]

Well, what's your timezone id ?

Claudiu

[Kowshik Nandagudi]

TimeZone ID is "Europe/London"

[Claudiu Chelemen]

I believe it looks also at the current time.
If you set the hour on the calendar to 0, will it return true ?

If I am not mistaken, DST ends at 01:00 GMT.

Claudiu

[Campbell Ritchie]

Claudiu Chelemen wrote: . . . If I am not mistaken, DST ends at 01:00 GMT. . . .

That is correct. After 1.59am (BST) came 1.00am (GMT) on 30th October this year.

[Kowshik Nandagudi]

but i dont want to specify the time. just need to know if dst applies on that day

[Joanne Neal]

Kowshik Nandagudi wrote:but i dont want to specify the time. just need to know if dst applies on that day

From midnight until 1am it does, from 2am onwards it doesn't, between 1am and 2am I'm not sure because that hour happens twice. So the answer to whether DST applies on that day is yes and no. You'll have to decide how you are going to handle that.

[Winston Gutkowski]

Kowshik Nandagudi wrote:but i dont want to specify the time. just need to know if dst applies on that day

What Joanne said.

If you only need to know whether most or all of the day was in DST or not, set the time to 12 noon.

Winston