📅 Date & Time
8 free date & time — date calculator, age finder, time zone converter, countdown timer, Unix timestamp, week number and more. Handles all time zones, no sign-up required.
🌍 Time Zone Converter
Convert times between New York, London, Tokyo, Dubai, Sydney and 55+ time zones. See hour difference and UTC equivalent — free time zone converter.
⏱️ Online Stopwatch
Online stopwatch with lap timer, millisecond precision, and lap history. Start/pause, lap, and reset — free online stopwatch, works offline in browser.
📅 Date Calculator
Add or subtract days, weeks, months, or years from a date and see the result plus how many days that is from today. Free online date calculator.
⏳ Countdown Timer
Create countdown timers to any date and time. Track days, hours, minutes, and seconds until events, deadlines, and launches — free online countdown timer.
🌍 World Clock
See the current time in 8 major world cities at a glance, updating live every second — free online world clock.
⏱️ Unix Timestamp Converter
Convert Unix timestamps (in seconds) to human-readable dates and back. Shows UTC and your browser's local time — free online converter.
⌛ Time Duration Calculator
Calculate the duration between a start and end date/time, down to the second, with results in hours, minutes, seconds, and decimal hours. Free online.
📅 Week Number Calculator
Find the ISO week number for any date, along with day of year, day of week, and days remaining in the year. Free online week number calculator.
About Date & Time
8 date and time utilities for scheduling, time-zone conversion, and calendar arithmetic. Convert Unix timestamps, calculate durations between dates, find the current week number, run a stopwatch, and more — with automatic daylight saving time handling. Your system clock and local time zone are detected automatically.
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Frequently Asked Questions
Do the date and time tools account for daylight saving time?
Yes. All tools use your browser's built-in Intl and Date APIs, which include complete daylight saving time rules for all IANA time zones worldwide. You do not need to make any manual adjustments for DST transitions.
What time zones do the tools support?
All IANA/Olson time zone database entries are supported — over 600 time zones including all standard, historical, and regional zones. Common zones (UTC, EST, PST, CET, IST, JST, etc.) are available by name. The tool auto-detects your local time zone by default.
Do the tools handle leap years correctly?
Yes. The Date Calculator, Countdown Timer, and other tools use browser-native date arithmetic, which correctly handles all leap years, including the 100/400-year rules of the Gregorian calendar.
Can I use these tools offline?
Yes. All date and time tools work offline after the page has loaded, since they use no external data sources. The World Clock and Time Zone Converter use your device's system clock and timezone database.