How to parse String date to date object in ios swift? - ios

Question

I am parsing date from server into a custom format :-
This is the date :- "8/9/2017 3:58:00 AM" but it is not parsing into Date object using this format "MM/dd/yyyy hh:mm:ss a" because obviously the month, day and hour is single digit
As per my knowledge it should parse automatically because Android's DateFormat parses the same date.
This is the code snippet i am using :-
func getDateString(_ dateString:String) -> String{
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "M/dd/yyyy hh:mm:ss a"
let date = dateFormatter.date(from: dateString)
dateFormatter.dateFormat = "dd MMM yyyy"
return dateFormatter.string(from: date!)
}
This function is returning null

Answer 1

Your code should work, although you should also add some error-checking.
Try this (it will run in a Playground):
// returns an empty string "" if the date format is invalid
func getDateString(_ dateString:String) -> String {
var strResult = ""
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "M/dd/yyyy hh:mm:ss a"
if let date = dateFormatter.date(from: dateString) {
dateFormatter.dateFormat = "dd MMM yyyy"
strResult = dateFormatter.string(from: date)
}
return strResult
}
let dateString = getDateString("8/9/2017 3:58:00 AM")
print(dateString) // prints "09 Aug 2017"
If you change your "source" string to an invalid date/time - such as changing the month from 8 to 18 or the hour from 3 to 13 - you will see the returned value is an empty string.