Terms of Use

Use these tools to calculate and understand everyday time and date questions.

Calculation assumptions

Results depend on your input, device clock, selected time zone and displayed counting rules. Check those settings before relying on a result. Working days do not include an automatic regional holiday calendar.

Alerts

Optional sound or browser notifications work only while the page remains open and your browser and device allow them. Closing the page, suspending your device or denying permissions can prevent an alert. These tools do not provide guaranteed alarms.

Calendar conventions

Calendar dates use the Gregorian calendar. Fixed-unit days mean 24 hours. Calendar months and years depend on the starting date. Month-end dates are clamped to the last valid day when needed.

Reporting problems

If a result appears incorrect, check the inputs and report a reproducible example. The code and test methods are available in the project repository.