ios - Getting UTC time for any time and handling daylight saving as well -


i have written function utc time string corresponding time string passed argument function.

+(nsstring *)getutctime:(nsstring *)selectedtime {     nsstring *strformat;     if ([self is24hourformat:selectedtime]){         strformat = @"hh:mm";     }     else{         strformat = @"hh:mm a";     }     nslocale *baselocale = [[nslocale alloc] initwithlocaleidentifier:@"en_us_posix"];      nsdateformatter *dateformatterlocal = [[nsdateformatter alloc] init];     [dateformatterlocal settimezone:[nstimezone systemtimezone]];     dateformatterlocal.locale = baselocale;     [dateformatterlocal setdateformat:strformat];      nsdate *selecteddate = [dateformatterlocal datefromstring:selectedtime];      nsdateformatter *dateformatterutc = [[nsdateformatter alloc] init];     [dateformatterutc settimezone:[nstimezone timezonewithname:@"utc"]];     dateformatterutc.locale = baselocale;     [dateformatterutc setdateformat:strformat];       nsstring *utctimestring = [dateformatterutc stringfromdate:selecteddate];     return utctimestring; }

it working fine mumbai, india time zone. if change timezone london, returning me same time i'm passing in function argument. utc+1 in london. nsdateformatter handle daylight saving?

you can use nstimezone methods shown below daylight saving: see nstimezone class reference

  1. isdaylightsavingtimefordate:// tell if day light saving exist date
  2. daylightsavingtimeoffset // tell how offset time daylight saving

use below code returns day light saving offset

var timezone:nstimezone = nstimezone(name:"europe/london")! print(timezone.daylightsavingtime) //this return true if day light saving present print(timezone.daylightsavingtimeoffset/(60*60))//this give number of hours day light saving offset should print("timezone: \(timezone)")//will give detail timezone

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