Another "Date and time" calculator. Set the reference date and time interval as a number of days, hours, minutes, and seconds (in any combination). The calculator displays the date with added and subtracted specified time intervals.
This calculator's creation was inspired by the following inquiry: December 5 20.00.00 the end of the action. We know the time required to act: 58 hours 20 minutes 45 seconds. The calculator should calculate the starting date and time of action. Hope it will help somebody.