Converting UTC date format to local nsdate
Something along the following worked for me in Objective-C :
// create dateFormatter with UTC time format
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss"];
[dateFormatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];
NSDate *date = [dateFormatter dateFromString:@"2015-04-01T11:42:00"]; // create date from string
// change to a readable time format and change to local time zone
[dateFormatter setDateFormat:@"EEE, MMM d, yyyy - h:mm a"];
[dateFormatter setTimeZone:[NSTimeZone localTimeZone]];
NSString *timestamp = [dateFormatter stringFromDate:date];
I keep these two websites handy for converting different time formats: http://www.w3.org/TR/NOTE-datetime
http://benscheirman.com/2010/06/dealing-with-dates-time-zones-in-objective-c/
In Swift it will be:
// create dateFormatter with UTC time format
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"
dateFormatter.timeZone = NSTimeZone(name: "UTC") as TimeZone?
let date = dateFormatter.date(from: "2015-04-01T11:42:00")// create date from string
// change to a readable time format and change to local time zone
dateFormatter.dateFormat = "EEE, MMM d, yyyy - h:mm a"
dateFormatter.timeZone = NSTimeZone.local
let timeStamp = dateFormatter.string(from: date!)
Try this Swift extension
Swift 4: UTC/GMT ⟺ Local (Current/System)
extension Date {
// Convert local time to UTC (or GMT)
func toGlobalTime() -> Date {
let timezone = TimeZone.current
let seconds = -TimeInterval(timezone.secondsFromGMT(for: self))
return Date(timeInterval: seconds, since: self)
}
// Convert UTC (or GMT) to local time
func toLocalTime() -> Date {
let timezone = TimeZone.current
let seconds = TimeInterval(timezone.secondsFromGMT(for: self))
return Date(timeInterval: seconds, since: self)
}
}
// Try it
let utcDate = Date().toGlobalTime()
let localDate = utcDate.toLocalTime()
print("utcDate - \(utcDate)") //Print UTC Date
print("localDate - \(localDate)") //Print Local Date
Swift version of c_rath answer:
// create dateFormatter with UTC time format
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"
dateFormatter.timeZone = NSTimeZone(name: "UTC")
let date = dateFormatter.dateFromString("2015-04-01T11:42:00")
// change to a readable time format and change to local time zone
dateFormatter.dateFormat = "EEE, MMM d, yyyy - h:mm a"
dateFormatter.timeZone = NSTimeZone.localTimeZone()
let timeStamp = dateFormatter.stringFromDate(date!)
I had to remove both z and milli seconds from c_rath solution. Works in swift 4.
extension String {
func fromUTCToLocalDateTime() -> String {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"
dateFormatter.timeZone = TimeZone(abbreviation: "UTC")
var formattedString = self.replacingOccurrences(of: "Z", with: "")
if let lowerBound = formattedString.range(of: ".")?.lowerBound {
formattedString = "\(formattedString[..<lowerBound])"
}
guard let date = dateFormatter.date(from: formattedString) else {
return self
}
dateFormatter.dateFormat = "EEE, MMM d, yyyy - h:mm a"
dateFormatter.timeZone = TimeZone.current
return dateFormatter.string(from: date)
}
}