Age calculator
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Date add / subtract
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Text & Productivity
Age & Date Calculator
Calculate exact age, total days, and future or past dates from a selected date. Free, fast, and built for a clean browser workflow.
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About this tool
Find exact age in years, months, and days between a birth date and any target date — useful for forms, milestones, eligibility checks, and personal timelines.
Add or subtract days from a date when you need deadlines, warranty end dates, or project offsets without opening a spreadsheet.
Calculations use your browser’s date logic, including leap years, and stay on your device.
Tips for better results
- Enter dates carefully with the correct day/month order expected by your browser controls.
- For “age today,” set the target date to today; for a future milestone, pick that future date.
- Negative day offsets move backward — handy for “what date was 90 days ago?” workflows.
- Legal age cutoffs can depend on time zone and local rules; confirm official requirements when it matters.
How to use
- 1 Add a birth date and target date.
- 2 Review exact age and total days.
- 3 Use date add/subtract for future or past dates.
FAQ
Can I calculate age on a future date?
Yes. Choose any target date on or after the birth date.
Can I subtract days?
Yes. Enter a negative number in the add-days field to move backward.
Does it handle leap years?
Yes. Browser date logic accounts for leap years in typical cases.
Can I get total days lived?
Yes. The summary includes total days between the dates you enter.
Is my birth date stored?
No. Dates are processed locally and not saved by ShishwaLab.
Why might results differ by one day?
Time zones and whether the end date is inclusive can cause off-by-one differences versus other calculators.