ADDHOURS Function
From Planfix
ADDHOUR() — function adds or subtracts a specified number of hours from the selected date.
Format
ADDHOUR(Date, Count)
Examples
Subtract -3 hours from today's date (24-06-2022 10:10):
ADDHOUR(Now();-3) — Result: 24-06-2022 07:10
Add +4 hours to today's date (24-06-2022 10:15):
ADDHOUR(Now();4) — Result: 24-06-2022 14:15