Joomla 3.9.1:
(https://image.prntscr.com/image/wAkJDdc3R5GFqaVj82HBCw.png)
VM 3.4.2:
(https://image.prntscr.com/image/FVvpc99uRXiLh8bX-fD2UQ.png)
I need to set time in custom fields, but i can't
In front or back-end ?
Joomla uses a bootstraped date/time picker since version 3.7, while VirtueMart has always been using the jquery-ui datepicker, which is relatively easy to customize with the jquery ThemeRoller. Maybe you can add a time field with this time picker addon: https://github.com/trentrichardson/jQuery-Timepicker-Addon (Never tried it myself)