This is still when you work with "00:00:00". In my case, it ADDS 3 HOURS.
DATE_TIME_RESULT is a date-time field
PICK_A_DATE is a date only field
TIME is a text string, and you have to type it like 00:01:00 or similar.
input.DATE_TIME_RESULT = (input.PICK_A_DATE + " " + input.TIME).toTime();
Try it here using 00:00:00