iPad-夏令时转换

Question

I'm facing an issue, I have NSString that I want to convert to NSDate, region on my device is set to New York so when daylight saving is active my app misbehaves,

Like eg: 03/08/2015 02:00 - 03/08/2015 02:59

Whenever the user selects this date-range the datepicker moves it an hour into the future which it should as daylight saving is active but I want my app to be able to pick/select this date-range because in some other region some other user is using the app at this date-range & doing some transaction so how can I my app to handle daylight saving.

Above scenario happens if user picks the date-range from NSDatePicker or If I try to create that date-range using NSDate & NSDateFormatter.

Thanks.

Answer 1

You asked about NSDatePicker , but I believe that is for OSX. The datepicker class in iOS is UIDatePicker . At least, this is how it appears from the documentation.

Both of these classes have a timeZone property, which you can set to any valid NSTimeZone instance. When not set explicitly, the default behavior is to use the local time zone.

So if you want to pick a time in another time zone, with different DST rules, then just set the time zone accordingly. You might consider using the UTC time zone if you want to be able to accept all values.