How to get DateTime with zeroed time in Flutter - flutter

Question

I'm new to Flutter and I'm trying to output the start of the current day in UTC format.
I use Flutter 3.3.7 and Dart SDK 2.18.4.
First, I take the current date.
DateTime dt = DateTime.now();
Next, I use extension for the DateTime class, which I implemented myself.
extension DateTimeFromTimeOfDay on DateTime {
DateTime appliedFromTimeOfDay(TimeOfDay timeOfDay) {
return DateTime(year, month, day, timeOfDay.hour, timeOfDay.minute);
}
}
It outputs the same date, only with the time that I pass it via TimeOfDay class(In this case 00:00).
dt = dt.appliedFromTimeOfDay(const TimeOfDay(hour: 0, minute: 0));
print(dt.toUtc()); //2022-11-08 21:00:00.000Z
But when I run this code, it outputs a date with a non-zero time.
I also tried adding the toUtc() method to the extension.
extension DateTimeFromTimeOfDay on DateTime {
DateTime appliedFromTimeOfDay(TimeOfDay timeOfDay) {
return DateTime(year, month, day, timeOfDay.hour, timeOfDay.minute).toUtc();
}
}
That didn't work either.
How can I get the DateTime in UTC format with zeroed time of day? For example,
2022-11-08 00:00:00.000Z

Answer 1

DateTime has a utc constructor that allows you to do this.
extension DateTimeFromTimeOfDay on DateTime {
DateTime appliedFromTimeOfDay(TimeOfDay timeOfDay) {
return DateTime.utc(year, month, day, timeOfDay.hour, timeOfDay.minute);
}
}
DateTime today = DateTime.now()
.appliedFromTimeOfDay(const TimeOfDay(hour: 0, minute: 0)); // output: 2022-11-09 00:00:00.000Z (note the Z which indicate UTC)

Answer 2

Try it with this extension method
extension DateTimeExtension on DateTime {
DateTime getDateOnly() {
return DateTime(this.year, this.month, this.day);
}
}