Date & Time Calculators
Work with dates and time precisely. Calculate your age, the difference between two dates, business days, the day of the week for any date, ISO week numbers, time-zone conversions, and days until an event.
9 free calculators · no sign-up · instant results
Dates
Business Days Calculator
Working days between two dates, excluding weekends
Age Calculator
Exact age in years, months, days, and weeks
Date Calculator
Days between dates or add/subtract days
Days Until Calculator
Countdown to any future or past date
Day of the Week Calculator
What day of the week any date falls on
Week Number Calculator
The ISO week number for any date
Time
Frequently asked questions
How does the business days calculator work?
It counts working days between two dates, excluding weekends, so you can plan deadlines and delivery windows accurately.
Are time-zone conversions daylight-saving accurate?
Yes — the Time Zone Converter uses the official IANA time-zone database, so it applies the correct offset and DST rules for the exact date you choose.