Date & Time Tools

Turn Unix timestamps into human-readable dates and back, in seconds or milliseconds, with any timezone applied — all locally in your browser.

Find the number of days, weeks, months, and years between two dates — with exact breakdowns and no calendar math errors.

Pick a moment in one timezone and see it in another — including IANA zones, DST-aware offsets, and a simultaneous UTC readout.

Enter a birth date and instantly get the precise age — years, months, and days — as of today or any date you choose.

Paste a date in almost any format and get it back as ISO 8601, RFC 2822, Unix timestamp, and your locale's long and short forms.

Turn Unix timestamps into human-readable dates and back, in seconds or milliseconds, with any timezone applied — all locally in your browser.

Paste a date in almost any format and get it back as ISO 8601, RFC 2822, Unix timestamp, and your locale's long and short forms.

Convert a Gregorian date to a Julian day number (JD / MJD) and back — used in astronomy, time-series, and legacy systems.

Decode ISO 8601 duration strings (PT1H30M, P2W, P3Y6M) into readable time spans, or assemble one from unit inputs.

Watch the current Unix timestamp tick in real time — seconds, milliseconds, microseconds, ISO 8601, and your local time all at once.

Find the number of days, weeks, months, and years between two dates — with exact breakdowns and no calendar math errors.

Count working days between two dates or add N business days to a start date — weekends skipped, optional holiday list applied.

Enter a start and end date to get the number of whole weeks between them, the leftover days, and the total day count — all in the browser.

Enter a start and end date to get the number of calendar months between them — not a rough days ÷ 30 estimate — plus the remaining days and total days.

Enter a start and end date to get the whole years between them, plus the leftover months and days and the total day count.

Enter a date to get its day of the year, the number of days in that year, how many days remain, and whether it is a leap year.

Enter a birth date and instantly get the precise age — years, months, and days — as of today or any date you choose.

Enter a birth date to get the exact number of days lived as of today or a chosen date, with the same span expressed in weeks and days.

Enter a birth date to get the total number of whole weeks lived as of today or a chosen date, plus the remaining days and total days.

Enter a birth date to get the total number of calendar months lived as of a date, split into years and months, with the remaining days and total days.

Compute total hours and minutes worked from start and end times (with optional breaks) across a day or a weekly timesheet.

Take a start date and add or subtract any combination of days, weeks, months, and years — with month-end handling done right.

Enter a date and a number of months to add (negative to subtract) and get the resulting date — with January 31 + 1 month clamped to the end of February, and the clamp explained.

Find the exact duration between two times of day (handling overnight spans) or sum a list of durations like 1h 30m + 45m.

Pick a moment in one timezone and see it in another — including IANA zones, DST-aware offsets, and a simultaneous UTC readout.

Add any number of cities and see their live local times side by side — perfect for scheduling calls across timezones.

Decode any 5-field cron expression into readable schedule text, or build one from dropdowns — perfect for scheduling jobs.

Build recurrence rules (FREQ=DAILY;INTERVAL=2…) from friendly controls, or paste an RRULE to see the next occurrences.

Search 100+ timezone abbreviations (EST, PST, CET, JST, IST…) to find their full names, UTC offsets, and the regions that use them.

Pick a target moment and watch a live countdown of days, hours, minutes, and seconds — with a shareable result.

Enter a date and get its ISO 8601 week number and the week's start and end dates — handy for sprint planning and reporting.

Enter any date and instantly see the weekday, plus its day-of-year position and how many days remain in the year.

Enter any year to see if it's a leap year, with the rule explained: divisible by 4, except centuries unless divisible by 400.

Enter a date and your fiscal year's start month to see the fiscal year, quarter, and days remaining in that quarter.

Produce every date between a start and end date — daily, weekly, monthly, or by custom interval — ready to copy into a spreadsheet.

Paste a date or timestamp and see it as human relative time — 'just now', '5 minutes ago', 'in 2 weeks' — in multiple languages.

Enter a latitude/longitude (or pick a city) and date to estimate sunrise, sunset, and daylight duration using a solar-position algorithm.

Find the moon phase for any date — new, waxing, full, waning — with the illumination percentage and phase age.

Time anything with a millisecond-accurate stopwatch (laps included) or a countdown timer that alerts when time's up — no uploads.

Turn Unix timestamps into human-readable dates and back, in seconds or milliseconds, with any timezone applied — all locally in your browser.

Find the number of days, weeks, months, and years between two dates — with exact breakdowns and no calendar math errors.

Pick a moment in one timezone and see it in another — including IANA zones, DST-aware offsets, and a simultaneous UTC readout.

Add any number of cities and see their live local times side by side — perfect for scheduling calls across timezones.

Pick a target moment and watch a live countdown of days, hours, minutes, and seconds — with a shareable result.

Paste a date in almost any format and get it back as ISO 8601, RFC 2822, Unix timestamp, and your locale's long and short forms.

Enter a birth date and instantly get the precise age — years, months, and days — as of today or any date you choose.

Count working days between two dates or add N business days to a start date — weekends skipped, optional holiday list applied.

Decode any 5-field cron expression into readable schedule text, or build one from dropdowns — perfect for scheduling jobs.

Decode ISO 8601 duration strings (PT1H30M, P2W, P3Y6M) into readable time spans, or assemble one from unit inputs.

Enter a date and get its ISO 8601 week number and the week's start and end dates — handy for sprint planning and reporting.

Take a start date and add or subtract any combination of days, weeks, months, and years — with month-end handling done right.

Build recurrence rules (FREQ=DAILY;INTERVAL=2…) from friendly controls, or paste an RRULE to see the next occurrences.

Search 100+ timezone abbreviations (EST, PST, CET, JST, IST…) to find their full names, UTC offsets, and the regions that use them.

Watch the current Unix timestamp tick in real time — seconds, milliseconds, microseconds, ISO 8601, and your local time all at once.

Enter any date and instantly see the weekday, plus its day-of-year position and how many days remain in the year.

Enter any year to see if it's a leap year, with the rule explained: divisible by 4, except centuries unless divisible by 400.

Find the exact duration between two times of day (handling overnight spans) or sum a list of durations like 1h 30m + 45m.

Time anything with a millisecond-accurate stopwatch (laps included) or a countdown timer that alerts when time's up — no uploads.

Enter a latitude/longitude (or pick a city) and date to estimate sunrise, sunset, and daylight duration using a solar-position algorithm.

Find the moon phase for any date — new, waxing, full, waning — with the illumination percentage and phase age.

Enter a date and your fiscal year's start month to see the fiscal year, quarter, and days remaining in that quarter.

Produce every date between a start and end date — daily, weekly, monthly, or by custom interval — ready to copy into a spreadsheet.

Paste a date or timestamp and see it as human relative time — 'just now', '5 minutes ago', 'in 2 weeks' — in multiple languages.

Convert a Gregorian date to a Julian day number (JD / MJD) and back — used in astronomy, time-series, and legacy systems.

Compute total hours and minutes worked from start and end times (with optional breaks) across a day or a weekly timesheet.

Enter a start and end date to get the number of whole weeks between them, the leftover days, and the total day count — all in the browser.

Enter a start and end date to get the number of calendar months between them — not a rough days ÷ 30 estimate — plus the remaining days and total days.

Enter a start and end date to get the whole years between them, plus the leftover months and days and the total day count.

Enter a date and a number of months to add (negative to subtract) and get the resulting date — with January 31 + 1 month clamped to the end of February, and the clamp explained.

Enter a birth date to get the exact number of days lived as of today or a chosen date, with the same span expressed in weeks and days.

Enter a birth date to get the total number of whole weeks lived as of today or a chosen date, plus the remaining days and total days.

Enter a birth date to get the total number of calendar months lived as of a date, split into years and months, with the remaining days and total days.

Enter a date to get its day of the year, the number of days in that year, how many days remain, and whether it is a leap year.