Reset all of the remaining time units

You can insert an exclamation into the DateTime::createFromFormat method to reset all of the remaining time units

1// 2021-10-12 21:48:07.0
2DateTime::createFromFormat('Y-m-d', '2021-10-12');
3 
4// 2021-10-12 00:00:00.0
5DateTime::createFromFormat('!Y-m-d', '2021-10-12');
6 
72021-10-12 21:00:00.0
8DateTime::createFromFormat('!Y-m-d H', '2021-10-12');

Tip given by @SteveTheBauman