Add or subtract time from any date and see the exact result instantly
Choose a start date, pick whether to add or subtract, enter an amount, and select a unit (days, weeks, months, or years). The result date and the exact difference in days, months, and years appear instantly.
Useful for project deadlines, contract periods, event planning, or any calculation involving calendar arithmetic. Everything runs entirely in your browser — no data is sent anywhere.
Yes, Date Calculator is completely free to use on UtilityCove.
No. Date Calculator runs in your browser, so your input stays on your device.
Yes. Date Calculator works on modern mobile and desktop browsers.
Age Calculator
Calculate exact age in years, months, days, and hours.
Business Days Calculator
Calculate working days between two dates.
Date Formatter
Format any date in 12 different patterns.
Unix Timestamp Converter
Convert Unix epoch seconds or milliseconds to readable dates and back.
Time Zone Converter
Convert times between world time zones.
Week Number
Find the ISO and regular week number for any date.