You might want to err on the side of caution and ensure that the Calendar object is explicitly set to Gregorian rather than using the current system setting.
Jonathan > On 15 May 2017, at 13:50, Eric E. Dolecki <edole...@gmail.com> wrote: > > Thanks for your reply. Does this look safe to use? > > // London > let locale = TimeZone.init(abbreviation: "BST") > let cal = Calendar.current > let date = Date() > let comp = cal.dateComponents(in:locale!, from: date) > > // Local (right now for me it's Boston) > let hour = Calendar.current.component(.hour, from: date) > > print("HOUR OFFSET: \(comp.hour! - hour)") //HOUR OFFSET: 5 > > It's okay if the modifier is negative (Los Angeles from Boston, etc.) > > > > > > > On Sun, May 14, 2017 at 9:29 PM Jens Alfke <j...@mooseyard.com> wrote: > >> >>> On May 14, 2017, at 5:47 PM, Eric Dolecki <edole...@gmail.com> wrote: >>> >>> I have a clock. If like to present the times in a few major cities. Say >> London, England. Based on the user's current time zone, present the correct >> hour, min, and second for London. If I can see how to do it for one city, I >> should be good for others. >> >> Get an NSTimeZone instance based on a GMT offset or a name >> Create an NSDateFormatter and set its timeZone property. >> Use the formatter to convert [NSDate date] to a string. >> >> If you want to display the time in some other way, like an analog clock, >> use NSDateComponents instead of NSDateFormatter; then you can get the >> hours, minutes and seconds. >> >> —Jens > _______________________________________________ > > Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) > > Please do not post admin requests or moderator comments to the list. > Contact the moderators at cocoa-dev-admins(at)lists.apple.com > > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/cocoa-dev/lists%40mugginsoft.com > > This email sent to li...@mugginsoft.com _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com