Add standard formatters

[hashemim66110]

hello.

it would be a good idea if you add some standard formatters to default formatter of library.
basic things like:
...formatter.dYMD (results: 1404/01/01)
...formatter.tHM (results: 14:50)

thank you.

[FatulM]

Hello,
I published a new version of shamsi_date as your request.
In the new version there are formatters for time information.
Your requirement can be implemented with a simple extension class.
May be I add your requirement in the future, but now I don't have time.

extension MyISOFormatters on DateFormatter {
  String get iso_tHM => '$tHH:$tMM';
  String get iso_dYMD => '$yyyy$ds$mm$ds$dd';
}

Note that ds is / in persian date and - in english date.

[FatulM]

If you don’t have any comments,
I will close this issue for the time being,
But be sure to reopen it if you want.
@hashemim66110