Xcode Swift am/pm time to 24 hour format

Just convert it to a date using NSDateFormatter and the "h:mm a" format and convert it back to a string using the "HH:mm" format. Check out this date formatting guide to familiarize yourself with this material.

let dateAsString = "6:35 PM"let dateFormatter = NSDateFormatter()dateFormatter.dateFormat = "h:mm a"dateFormatter.locale = Locale(identifier: "en_US_POSIX") // fixes nil if device time in 24 hour formatlet date = dateFormatter.dateFromString(dateAsString)dateFormatter.dateFormat = "HH:mm"let date24 = dateFormatter.stringFromDate(date!)

Swift 3

Time format 24 hours to 12 hours

let dateAsString = "13:15"let dateFormatter = DateFormatter()dateFormatter.dateFormat = "HH:mm"let date = dateFormatter.date(from: dateAsString)dateFormatter.dateFormat = "h:mm a"let Date12 = dateFormatter.string(from: date!)print("12 hour formatted Date:",Date12)

output will be 12 hour formatted Date: 1:15 PM

Time format 12 hours to 24 hours

let dateAsString = "1:15 PM"let dateFormatter = DateFormatter()dateFormatter.dateFormat = "h:mm a"let date = dateFormatter.date(from: dateAsString)dateFormatter.dateFormat = "HH:mm"let Date24 = dateFormatter.string(from: date!)print("24 hour formatted Date:",Date24)

output will be 24 hour formatted Date: 13:15

Swift 3 *

Code to convert 12 hours (i.e. AM and PM) to 24 hours format which includes-

Hours:Minutes:Seconds:AM/PM to Hours:Minutes:Seconds

func timeConversion24(time12: String) -> String {    let dateAsString = time12    let df = DateFormatter()    df.dateFormat = "hh:mm:ssa"    let date = df.date(from: dateAsString)    df.dateFormat = "HH:mm:ss"    let time24 = df.string(from: date!)    print(time24)    return time24}

Input

07:05:45PM

Output

19:05:45

Similarly

Code to convert 24 hours to 12 hours (i.e. AM and PM) format which includes-

Hours:Minutes:Seconds to Hours:Minutes:Seconds:AM/PM

func timeConversion12(time24: String) -> String {    let dateAsString = time24    let df = DateFormatter()    df.dateFormat = "HH:mm:ss"    let date = df.date(from: dateAsString)    df.dateFormat = "hh:mm:ssa"    let time12 = df.string(from: date!)    print(time12)    return time12}

Input

19:05:45

Output

07:05:45PM