Parsing 24 HR Time to DateTime

Question

I am attempting to convert the following 2HR time in String to a DateTime, so that I manage it appropriately.

"1800"

This question came close, but no one answered how to convert the String into a valid DateTime.

How to convert time stamp string from 24 hr format to 12 hr format in dart?

Attempt 1:

DateTime.parse("1800") -

Invalid Date Format

Attempt 2:

DateTime.ParseExact("1800") -

This doesn't seem to exist, although it shows up on various

Still no luck and need a second pair of eyes to point out the obvious to me.

score 1 · Accepted Answer · answered Aug 22 '21 at 03:21

The time by itself is not a datetime so you could do something like:

DateTime myTime(DateTime baseDate, String hhmm) {
  assert(hhmm.length == 4, 'invalid time');
  final _hours = int.parse(hhmm.substring(0, 2));
  final _mins = int.parse(hhmm.substring(2, 2));
  return DateTime(baseDate.year, baseDate.month, baseDate.day, _hours, _mins);
}

score 0 · Answer 2 · answered Aug 22 '21 at 06:41

DateTime.parse expects to parse dates with times, not just times. (You can't even create a DateTime object without a date!)

Some people generate a dummy date string, but in your case you could trivially parse it with int.parse and then apply appropriate division and remainder operations:

var rawTime = int.parse('1800');
var hour = rawTime ~/ 100;
var minute = rawTime % 100;

Also see How do I convert a date/time string to a DateTime object in Dart? for more general DateTime parsing.

Parsing 24 HR Time to DateTime

2 Answers2