How to use
Today’s date and the current time are filled in by default — just enter how many hours and minutes to add or subtract. You can also pick any other date and time and add whole days to the duration. The calculator shows the resulting time, the date and which day it falls on.
Examples
- 10:30 PM + 3 hours = 1:30 AM the next day.
- October 30, 9:00 PM + 2 days 12 hours 15 minutes = November 2, 9:15 AM.
- 1:00 AM − 2 hours 30 minutes = 10:30 PM the previous day.
FAQ
What time will it be in 8 hours? Keep the current time, choose “Add” and enter 8 hours.
What time was it 5 hours ago? Same thing, with “Subtract”.
What time will I arrive? Leaving at 2:10 PM with a 5 hour 20 minute drive — add them to get 7:30 PM.
When does my shift end? Starting at 9:00 PM for 12 hours — the shift ends at 9:00 AM the next day.
When do I need to leave to be on time? You need to be there by 9:00 AM and the trip takes 1 hour 40 minutes — subtract to get 7:20 AM.
When should the roast go in the oven? Dinner is at 7:00 PM and it needs 2 hours 30 minutes — put it in at 4:30 PM.
When should a delayed-start washer or dishwasher begin? For a 2 hour 30 minute cycle to finish by 7:00 AM, subtract 2:30 from 7:00 to get 4:30 AM.
When does a 16:8 fasting window end? Last meal at 8:00 PM + 16 hours = 12:00 PM the next day.
Is daylight saving time taken into account? No, this is plain clock arithmetic. On the night the clocks change, real time may differ by an hour.
How do I find the time between two times? Use the time duration calculator.