Add and Subtract Time

A small tool for calculating with time data. Insert two periods of time and choose, if you want them to add or to subtract. The transitions between the time units are calculated correct.

Example: 16 hours, 30 minutes plus 12 hours, 45 minutes adds up to one day, 5 hours and 15 minutes.

One minute has 60 seconds, one hour has 60 minutes or 3600 seconds, one day has 24 hours or 1440 minutes or 86400 seconds. An average year has a length of 365.24 days.