Xcode swift am pm time to 24 hour format

Question

I am trying to convert a am pm format time to a 24 hour format time  6 35 PM to 18 35   I tried this piece of code on playground but it doesnt seem to work if I put the time alone  let dateAsString    02 12 15  6 35 PM  let dateFormatter   NSDateFormatter   dateFormatter dateFormat    HH  let date   dateFormatter dateFromString dateAsString    returns nil   Does anyone know how to accomplish this   Thank you

User · Answer

Use this function for date conversion  its working fine when your device in 24 12 hr format See https   developer apple com library archive qa qa1480  index html func convertDateFormatter fromFormat String toFormat String   dateString  String  - gt  String      let formatter   DateFormatter       formatter locale   Locale identifier   quot en US POSIX quot       formatter dateFormat   fromFormat     let date   formatter date from  dateString      formatter dateFormat   toFormat     return  date    nil   formatter string from  date      quot  quot

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Swift version 3 0 2   Xcode Version 8 2 1  8C1002   12 hr format     func getTodayString   - gt  String           let formatter   DateFormatter           formatter dateFormat    h mm ss a           formatter amSymbol    AM          formatter pmSymbol    PM           let currentDateStr   formatter string from  Date            print currentDateStr          return currentDateStr      OUTPUT   12 41 42 AM  Feel free to comment  Thanks

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let calendar   Calendar current let hours      calendar component  hour  from  Date    let minutes    calendar component  minute  from  Date    let seconds    calendar component  second  from  Date

User · Answer

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  let date   dateFormatter dateFromString dateAsString   dateFormatter dateFormat    HH mm  let date24   dateFormatter stringFromDate date

User · Answer

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  - gt  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  - gt  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

User · Answer

Here is code for other way around   For Swift 3   func amAppend str String  - gt  String      var temp   str     var strArr   str characters split  0         map String init      var hour   Int strArr 0        var min   Int strArr 1        if hour  gt  12           temp   temp    PM            else          temp   temp    AM            return temp

User · Answer

I am using a function here in my case by which I am updating a label with the normal time format and after that I am storing the selected time s 24hr format to do some another tasks    Here is my code     func timeUpdate sender  NSDate        let timeSave   NSDateFormatter     Creating first object to update time label as 12hr format with AM PM     timeSave timeStyle   NSDateFormatterStyle ShortStyle   Setting the style for the time selection      self TimeShowOutlet text   timeSave stringFromDate sender     Getting the string from the selected time and updating the label as 1 40 PM     let timeCheck   NSDateFormatter     Creating another object to store time in 24hr format      timeCheck dateFormat    HH mm ss    Setting the format for the time save      let time   timeCheck stringFromDate sender    Getting the time string as 13 40 00     self timeSelectedForCheckAvailability   time   At last saving the 24hr format time for further task      After writing this function you can call this where you are choosing the time from date time picker   Thanks  Hope this helped

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Here is the answer with more extra format     Xcode 12  Swift 5 3    let dateFormatter   DateFormatter   dateFormatter dateFormat    quot HH mm ss quot  var dateFromStr   dateFormatter date from   quot 12 16 45 quot     dateFormatter dateFormat    quot hh mm ss a  on  MMMM dd  yyyy quot    Output  12 16 45 PM on January 01  2000  dateFormatter dateFormat    quot E  d MMM yyyy HH mm ss Z quot    Output  Sat  1 Jan 2000 12 16 45  0600  dateFormatter dateFormat    quot yyyy-MM-dd T HH mm ssZ quot    Output  2000-01-01T12 16 45 0600  dateFormatter dateFormat    quot EEEE  MMM d  yyyy quot    Output  Saturday  Jan 1  2000  dateFormatter dateFormat    quot MM-dd-yyyy HH mm quot    Output  01-01-2000 12 16  dateFormatter dateFormat    quot MMM d  h mm a quot    Output  Jan 1  12 16 PM  dateFormatter dateFormat    quot HH mm ss SSS quot    Output  12 16 45 000  dateFormatter dateFormat    quot MMM d  yyyy quot    Output  Jan 1  2000  dateFormatter dateFormat    quot MM dd yyyy quot    Output  01 01 2000  dateFormatter dateFormat    quot hh mm ss a quot    Output  12 16 45 PM  dateFormatter dateFormat    quot MMMM yyyy quot    Output  January 2000  dateFormatter dateFormat    quot dd MM yy quot    Output  01 01 00    Output  Customisable AP PM symbols dateFormatter amSymbol    quot am quot  dateFormatter pmSymbol    quot Pm quot  dateFormatter dateFormat    quot a quot    Output  Pm     Usage var timeFromDate   dateFormatter string from  dateFromStr  print timeFromDate

User · Answer

Below is the swift 3 version of the solution -  let dateAsString    6 35 58 PM  let dateFormatter   DateFormatter   dateFormatter dateFormat    h mm ss a  let date   dateFormatter date from  dateAsString   dateFormatter dateFormat    HH mm ss  let date24   dateFormatter string from  date   print date24

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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

User · Answer

Unfortunately apple priority the device date format  so in some cases against what you put  swift change your format to 12hrs  To fix this is necessary to use setLocalizedDateFormatFromTemplate instead of dateFormat an hide the AM and PM   let formatter   DateFormatter   formatter setLocalizedDateFormatFromTemplate  HH mm ss a   formatter amSymbol      formatter pmSymbol      formatter timeZone   TimeZone secondsFromGMT  0  var prettyDate   formatter string from  Date      You can check a very useful post with more information detailed in  https   prograils com posts the-curious-case-of-the-24-hour-time-format-in-swift

[swift] Xcode swift am/pm time to 24 hour format

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