Time & Calendar Converters
Translate between the world's time formats: epoch timestamps, post IDs, Julian days, and three calendar systems.
Unix Timestamp Converter
Decode any epoch timestamp into readable dates, or turn dates back into timestamps — seconds or milliseconds.
Convert now → X / TWITTERX Post Timestamp Converter
Paste an X post link or Tweet ID and read the exact posting moment, decoded from the Snowflake ID.
Decode now → ZONESTimezone Converter
Convert time between 400+ IANA zones with daylight saving handled — plus live clocks for both zones.
Convert now → JULIAN DAYJulian Date Converter
Calendar dates ↔ Julian day numbers, with decimal precision for astronomy and logging.
Convert now → 农历Chinese Lunar Calendar
Gregorian ↔ lunar dates with zodiac years, Gan-Zhi, and leap-month support.
Convert now → HEBREWHebrew Calendar Converter
Gregorian ↔ Hebrew dates with correct month names and 13-month leap years handled.
Convert now →Date Calculators
Count it, check it, watch it tick: date differences, ordinal days, leap years, and live countdowns.
Date Difference Calculator
Days between two dates, plus weeks, a years-months-days breakdown, and business days.
Calculate now → ORDINALDay of Year Calculator
What day of the year is it? Ordinal day numbers both ways, leap-year aware.
Calculate now → LEAP YEARLeap Year Checker
Is this a leap year? Full Gregorian rule with the reasoning, plus next and previous leaps.
Check now → TICKINGCountdown to Date
A live countdown to any moment — days, hours, minutes, seconds updating every second.
Start now →How It Works — Three Easy Steps
No manual, no install, no account. Pick a tool, enter your values, read the answer.
- Pick your tool. Timestamps, date math, time zones, or calendar systems — each tool does one job well.
- Enter your values. Paste a timestamp, pick two dates, or choose zones. Defaults are pre-filled and live where it makes sense.
- Read the result. Answers appear instantly with UTC and local renderings where relevant — nothing ever leaves your browser.
100% Private
Every calculation runs locally. Timestamps from internal logs and private dates never touch a server.
Instant Results
No page reloads, no waiting. Math happens in milliseconds — live counters even tick in real time.
Time Zone Correct
The full IANA database with daylight saving handled — half-hour and 45-minute zones included.
Free Forever
No trial, no paywall, no account. Use one tool or all ten — the price is always zero.
Frequently Asked Questions
Are these date and time tools really free?
Yes. Every tool on this site is completely free, with no trial, no paywall, and no account. You can run as many calculations as you need.
Do my dates or timestamps get uploaded anywhere?
No. Every calculation runs inside your browser, so timestamps, dates, and log values never leave your device.
Which time zone do the converters use?
Timestamps and Julian days are UTC-based by definition, the timezone converter uses the full IANA database with daylight saving handled, and calendar tools use your browser's local time zone.
How accurate is the lunar or Hebrew calendar conversion?
The lunar converter covers 1900 to 2100 including leap months, and the Hebrew converter uses the browser's built-in Hebrew calendar with correct month names. Both are suitable for planning, though formal religious observance dates should be confirmed with an authority calendar.
Tips & Things to Watch
- Know your epoch format. 10-digit timestamps are seconds, 13-digit are milliseconds — the converter auto-detects, but it pays to know which one your system speaks.
- Time zones have quirks. India runs at UTC+5:30 and daylight saving shifts offsets twice a year — always convert for the exact date.
- Calendar years start differently. The Hebrew year begins in autumn and the lunar year at Chinese New Year, so January birthdays often belong to the previous calendar year.
- Leap years aren't just /4. Century years must divide by 400 — the leap year checker shows the full reasoning.
Pick a Tool, Get an Answer
Every converter and calculator above answers in under a second — right on this device.
Choose a Tool