MyTools guide

Working with Dates and Time Intervals

Calendar calculations can behave differently around month ends, leap days, and overnight shifts.

Calendar calculations can behave differently around month ends, leap days, and overnight shifts. Decide whether your task needs elapsed hours, calendar days, inclusive date counts, or calendar age. Keep time zones consistent and verify how a tool handles shifts crossing midnight or dates at month-end.

A practical checklist

1. Define the task and the result you need.
2. Check units, definitions, assumptions, and limitations.
3. Test a small example and compare it with a trusted reference.
4. Keep notes of the method when results will be shared or used for decisions.

Browse related tools in our tool collection, and verify important results independently.