Calculate date with formula

[peterberlin]

Hello
I ask for help.
Peter

field: dateStartDate (date/time)
field: closeDate (date)


code in workflow:

dateStartDate = datetime\addDays(targetEntity\attribute('closeDate '), -3);
dateStartDate = datetime\addHours(dateStartDate, 6)
duration = '900';

Result see screenshot. The day was calculated correctly.