Time Duration Calculator Guides
Step by step guides with worked examples for the Time Duration Calculator.
Decimal Time Explained
How decimal hours work, why 1.30 does not mean one hour thirty, and how to convert between decimal hours and hours and minutes correctly.
Read the guide →How to Add and Subtract Time
How to add or subtract minutes and hours from a clock time, handling midnight rollover and negative results correctly.
Read the guide →How to Calculate Time Between Two Times
How to calculate the hours and minutes between two clock times, handling midnight correctly, with worked examples for shifts and journeys.
Read the guide →Common Time Duration Mistakes
The mistakes people make with time duration calculations, including negative results, decimal hour confusion and the 24 hour limit.
Read the guide →Time Zones and Elapsed Time
How time zones affect elapsed time calculations, why a flight departing and arriving at the same local time still takes hours, and how to handle it.
Read the guide →