📅 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 any two time zones instantly. Find meeting times across cities worldwide with daylight saving adjustments — free online time zone converter.
â±ï¸ Online Stopwatch
Online stopwatch with lap timer, millisecond precision, and lap history. Start, stop, lap, and reset — free online stopwatch, works offline in browser.
📅 Date Calculator
Calculate the number of days between two dates or add/subtract days from a date. Find working days, weekends, and public holidays — free online date calculator.
â³ 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 current time in multiple cities around the world simultaneously. Add your cities and see live clocks with date and DST status — free online world clock.
â±ï¸ Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and back. Supports seconds, milliseconds, and nanoseconds with any time zone — free online converter.
⌛ Time Duration Calculator
Calculate the total duration between two times, add or subtract time durations, and convert between hours, minutes, and seconds — free online time calculator.
📅 Week Number Calculator
Find the week number for any date. Calculate ISO week numbers, date ranges, and days remaining in the week or year — free online week number tool.
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.