Date & Time Tools
Calculate exact differences between dates (in years, months, days, and weeks) and convert times between global time zones with automatic daylight saving handling.
Seven focused utilities for the date and time calculations people need most. Calculate exact durations between dates, convert times across global time zones with DST handling, count down to events, compute your exact age, count working days between dates excluding holidays, compare live clocks across multiple time zones, and add or subtract hours and minutes to calculate total time durations. All tools use standard browser APIs for accurate, privacy-first calculations.
Date Difference Calculator
Calculate the exact difference between two dates.
Date & TimeTime Zone Converter
Convert times between any time zones instantly.
Date & TimeCountdown Timer
Set a target date and time, then watch a live countdown in days, hours, minutes, and seconds.
Date & TimeAge Calculator
Calculate your exact age in years, months, and days.
Date & TimeWork Days Calculator
Count working days between two dates, excluding weekends and holidays.
Date & TimeWorld Clock Dashboard
View live clocks for multiple timezones side by side.
Date & TimeTime Duration Calculator
Add, subtract, and calculate durations between times.
Date & TimeFrequently Asked Questions
- Do these tools handle daylight saving time?
- Yes. The timezone converter uses the IANA timezone database built into modern browsers, which includes all DST transition rules for every region worldwide.
- Which calendar system is used?
- All tools use the Gregorian calendar, the international standard for civil dates. Leap years are handled correctly, including the century rule (divisible by 100 but not 400).
- Can I convert timestamps in milliseconds?
- Yes. The timestamp converter (in Developer Tools) auto-detects whether your input is in seconds (10 digits) or milliseconds (13 digits) and converts accordingly.
- What practical scenarios are these tools used for?
- Calculating how many days until a deadline, finding the exact duration of a contract, converting meeting times between New York and Tokyo, checking age in years and months, and planning event schedules across time zones.
Related Guides
View allWhen to Use These Tools
Date and time questions are deceptively tricky — how many business days until a deadline, what time is 3 PM London in Tokyo, does this timestamp represent today or yesterday. These tools give you accurate answers that account for leap years, varying month lengths, and daylight saving transitions.
Common uses include calculating project durations for proposals, finding exact age in years and months, converting meeting times for distributed teams, and checking how many days remain before a contract expiration date.
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