Date Difference
Find the time between any two calendar dates.
8 tools · Always free
Date & Time
Calculate date differences, working days, business dates, ISO week numbers, time durations, time zones, and Unix timestamps online.
Add Days to Date
Move a date forward or back by days, months, or years.
Working Days Calculator
Count working days with your schedule and holidays.
Business Days Calculator
Find a future or past business date.
Week Number Calculator
Find the ISO week, week dates, and day of year.
Time Duration Calculator
Calculate elapsed time, including overnight hours.
IST ↔ EST Converter
Compare India, New York, and other time zones.
Unix Timestamp Converter
Convert between timestamps and readable dates.
Practical guides (English)
- Calendar days, business days, and time zones: choosing the right calculation — Worked examples for elapsed days, inclusive dates, working days, and New York–India time conversion, with clear assumptions and checks.
Plan dates, deadlines, and time differences
Count calendar or working days, move a date forward or backward, identify an ISO week, calculate elapsed time, and convert timestamps or time zones. The tools state how weekends, holidays, overnight periods, and daylight-saving changes affect the result.
Use Date Difference for calendar spans, Working Days when you need a custom workweek and holiday list, Business Days to find a deadline, or Unix Timestamp Converter when an application stores time as epoch seconds or milliseconds.
Popular tools
- Date Difference — Find the time between any two calendar dates.
- Add Days to Date — Move a date forward or back by days, months, or years.
- Working Days Calculator — Count working days with your schedule and holidays.
- Business Days Calculator — Find a future or past business date.