Time keeper
Date & time tools
Compare dates, count workdays, translate timestamps, and coordinate time zones.
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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 & 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 & time
Countdown timer
Run a live countdown to a future date and time.
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.