About these date tools
Dates look simple until you try to count them. Months have different lengths, leap years add a day and time zones shift with the seasons. These tools handle the awkward parts for you and give exact answers in the units you need.
Use them for forms that ask for your exact age, project plans, contract notice periods, event countdowns, medication or billing schedules, and international calls. Each tool explains how it counts so there are no surprises about whether an end date is included.
What each tool does
- Age Calculator: An age calculator finds the time between your date of birth and a chosen date. Enter both dates to get your exact age in years, months and days.
- Date Difference Calculator: To find the number of days between two dates, subtract the earlier date from the later one. This calculator also splits the result into years, months, weeks and weekdays.
- Days Until Calculator: Pick a date and the calculator shows how many days remain until it, or how many have passed since it. It also gives the number of weeks and the weekday.
- Add or Subtract Days From a Date: Enter a start date, choose add or subtract, then a number of days, weeks, months or years. The calculator shows the resulting date and weekday.
- Time Zone Converter: Choose a date and time and the zone it applies to. The converter shows the same moment in major cities around the world, including daylight saving changes.
- Time Calculator: Enter two durations in days, hours, minutes and seconds, choose add or subtract and see the result plus its total in hours, minutes and seconds.
- Work Hours Calculator: Enter your start and end time and your break. The tool shows hours worked per day in hours and minutes and as decimal hours, and your pay if you add a rate.
- Business Days Calculator: Choose a start and an end date and your weekend days. The tool counts working days, weekend days and total days in the range.
- Day of the Week Calculator: Choose a date to see the weekday, the day number in the year, the ISO week number, whether it is a leap year and how many days remain.
- Due Date Calculator: Enter the first day of your last period. The calculator adds 280 days to estimate your due date and shows how many weeks pregnant you are today.
How to choose the right tool
Use the age calculator for anything based on a birth date. Use the date difference calculator to measure the gap between two dates, and the days until calculator for a simple countdown. Use add or subtract days when you need a deadline, and the time zone converter when people in different countries must meet.
For legal and contract dates, always read the exact wording of the agreement. Some contracts count business days only or exclude the first day.
Frequently asked questions
Do the tools handle leap years?
Yes. They use real calendar dates.
Do they use my time zone?
Date tools use your device date. The time zone converter uses the zone you choose.
Do they skip public holidays?
No. Weekday counts skip weekends only.
Is my date of birth stored?
No.
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