tryParse static method

DateTime? tryParse(
  1. String input
)

Tries parsing the input being a RFC-822 date to the DateTime.

If fails to do so, then returns null.

Examples of the valid inputs:

  • Wed, 20 Mar 2024 12:00:03 +0300
  • Sun, 1 Jun 2024 15:10:51 +0000
  • Tue, 5 Dec 2000 01:02:03 GMT
  • 1 Sep 2007 23:23:59 +0100

Implementation

static DateTime? tryParse(String input) {
  // Replace the possible GMT to the +0000.
  input = input.replaceFirst('GMT', '+0000');

  final List<String> splits = input.split(' ');

  // Completely ignore the day of the week part.
  final int i = _days.any((e) => splits[0].startsWith(e)) ? 1 : 0;

  final String day = splits[i].padLeft(2, '0');
  final String? month = _months[splits[i + 1]];
  if (month == null) {
    return null;
  }

  final String year = splits[i + 2];
  final String time = splits[i + 3];
  final String zone = splits.elementAtOrNull(i + 4) ?? '+0000';

  return DateTime.tryParse('$year-$month-$day $time $zone');
}