You need elapsed calendar time
Compare two dates and read the gap using an inclusive or exclusive interpretation appropriate to the task. Open Date difference calculator
Time keeper
Date & time tools
Compare dates, count workdays, translate timestamps, and coordinate time zones.
Choose a job
What do you need to do?
Date & time
Unix timestamp converter
Convert Unix seconds or milliseconds to a readable date and back again.
Date & time
Date difference calculator
Calculate elapsed days, weeks, and calendar components between two dates.
Date & timeNew
Date add subtract calculator
Add or subtract days, weeks, months, or years from a date and see the result.
Date & time
Business days calculator
Count weekdays between dates while excluding weekends and optional holidays.
Date & time
Age calculator
Calculate age in years, months, and days as of a chosen date.
Date & time
Meeting time planner
Compare a proposed meeting time across several world time zones.
Date & timeNew
World clock converter
See the current time in cities worldwide, or convert a chosen time across time zones.
Date & time
Countdown timer
Run a live countdown to a future date and time.
What this collection covers
The jobs these tools handle
Date arithmetic that is easy to get wrong by one: how many days sit between two dates, how many of those are working days once weekends come out, what a Unix timestamp means in your own time zone, what time it is right now in another city, someone’s exact age today, and what hour a meeting lands on for everyone invited.
Choose the date tool by the counting rule
Elapsed calendar days, working days, and local clock times answer different questions. Confirm whether an end date is included and which time zone owns a deadline.
Weekends must be excluded
Count weekdays with your chosen weekend and holiday assumptions instead of subtracting them mentally. Open Business days calculator
People are in different time zones
Compare the same instant across locations and check daylight-saving offsets for the actual meeting date. Open Meeting time planner
Plan and communicate a deadline
Calculate from the governing start date, verify working-day assumptions, and share an explicit date and time zone rather than only a relative duration.
1. Calculate the candidate date
Add the required calendar interval to the agreed starting point and record the result. Open Date add subtract calculator
2. Check working-day rules
Recalculate when weekends or listed holidays do not count toward the required period. Open Business days calculator
3. Track the confirmed deadline
Use the final date for a countdown only after the inclusion rule and local time zone are settled. Open Countdown timer
Privacy-first by design
Your work stays with you
Selected files and entered text stay private while you use these tools.
Smooth results
Tips for larger files
Very large files can need more memory, especially on a phone. Keep originals, start with a small batch, and close other heavy apps or tabs if a tool feels slow.