Date Calculator
Guide: How to Read a Cron Expression (With Examples)
Nothing you enter or choose here leaves your device. This tool runs in your browser.
How to use
- 1Choose "Days between dates" or "Add / subtract time".
- 2Pick your start date, and an end date or the amount of time.
- 3Read the result, shown instantly.
- 4Change any date to try another scenario.
Frequently asked questions
Is the end date included in the count?
No. The count is the number of days from the start date to the end date, so the same day twice is 0 days and today to tomorrow is 1 day.
How are weekdays counted?
Weekdays are Monday to Friday between the two dates. Public holidays aren't excluded.
What happens when I add a month to January 31?
The result lands on the last day of the next month, so January 31 plus one month is February 28 (or 29 in a leap year).
Do time zones or daylight saving affect the answer?
No. Dates are calculated as calendar days, so clock changes never shift the result.
Read the guides
Learn how this works and how to get the most from it.
Developer
How to Read a Cron Expression (With Examples)
Learn what the five fields of a cron expression mean, how */5 and 1-5 work, and see common schedules explained clearly.
2 min read
Developer
Unix Timestamps Explained
What a Unix timestamp is, the difference between seconds and milliseconds, how time zones fit in, and the Year 2038 problem.
2 min read
Money, health & time
Time Zones, UTC and Daylight Saving: A Practical Guide
Why time zones cause bugs and missed meetings, what UTC is, how daylight saving shifts things, and rules for working across zones.
2 min read
Money, health & time
Week Numbers and Countdowns: ISO Weeks, Business Days and Time Left
How ISO and US week numbers work, why week 53 exists, how to count days and weekdays to a deadline, and where countdowns go wrong.
1 min read
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