Dart - How to set the hour and minute of DateTime object

var newHour = 5;
time = time.toLocal();
time = new DateTime(time.year, time.month, time.day, newHour, time.minute, time.second, time.millisecond, time.microsecond);

There were discussions to add an update() method that allows to modify specific parts only, but it doesn't look like this has landed.

now with extension u could do something like this

extension MyDateUtils on DateTime {
  DateTime copyWith({
    int? year,
    int? month,
    int? day,
    int? hour,
    int? minute,
    int? second,
    int? millisecond,
    int? microsecond,
  }) {
    return DateTime(
      year ?? this.year,
      month ?? this.month,
      day ?? this.day,
      hour ?? this.hour,
      minute ?? this.minute,
      second ?? this.second,
      millisecond ?? this.millisecond,
      microsecond ?? this.microsecond,
    );
  }
}

I got a simpler solution:

DateTime newDate = DateTime.now();
DateTime formatedDate = newDate.subtract(Duration(hours: newDate.hour, minutes: newDate.minute, seconds: newDate.second, milliseconds: newDate.millisecond, microseconds: newDate.microsecond));

Then the XX:XX from 'formatedDate' should be 00:00

Explanation:

formatedDate is a new DateTime variable with the content of newDate minus hours, minutes... from it

I believe this is a better solution than the accepted answer:

DateTime dateTime = DateFormat('dd-MM-yyyy h:mm:ssa', 'en_US').parseLoose('01-11-2020 2:00:00AM');