[flutter]Format Exception in DateFormat parse ()

Situation

When I try to convert a character string representing the time to DateTime type with parse () method of DateFormat with flutter, Format Exception is thrown.

DateTime dt=DateFormat.Hm().parse("19 : 00")　　//Format Exception

Cause and Solution

The format of the character string is incorrect. Delete the space before and after ":".

DateTime dt=DateFormat.Hm().parse("19:00")

Personally, I would like to put a space before and after the number ...