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Time zones
Time zone converter
Compare cities side-by-side. Every row editable. Share or embed.
Open tool →World clock
Live clocks for any cities. Business-hour ring. Local persistence.
Open tool →Meeting scheduler
Find the best overlap across timezones. Heatmap + top 3 slots.
Open tool →Team time zone planner
Who is online now and the best hour for a named team with individual hours.
Open tool →UTC offset globe
Interactive world map of every UTC offset, half-hour and 45-minute zones included.
Open tool →Military time zones
NATO phonetic letter codes from Zulu to Yankee, with each zone's UTC offset.
Open tool →Working hours by country
Typical office start and end times and weekly averages around the world.
Open tool →DST tracker
Which countries observe, abolished, or are debating daylight saving time.
Open tool →DST history
Per-country daylight saving adoption, abolition, and clock-change reforms.
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Date & duration
Age calculator
Years, months, ticking seconds. Dog years and milestones too.
Open tool →Days between dates
Calendar days, weekdays, business days with optional holidays.
Open tool →Date calculator
Add or subtract years, months, weeks, days. Business-day mode.
Open tool →Working days calculator
Skip weekends and per-country public holidays.
Open tool →Working days progress
How much of the work year has elapsed, by country calendar.
Open tool →Time since
Live counter from any past date and time.
Open tool →Week number
ISO and US week numbers. Reference table for the year.
Open tool →Week start by country
Whether the week starts Monday, Sunday, or Saturday, country by country.
Open tool →What day was it
Day-of-week lookup for any historical or future date.
Open tool →Year grid
Visual full-year calendar with holidays, weekends, and PNG export.
Open tool →Year progress
Live percent of the year, quarter, month, and week elapsed.
Open tool →Century boundary
When does a century or millennium really start: 2000 or 2001?
Open tool →Leap year calculator
Check if any year is a leap year and count leap years in a range.
Open tool →Recurring event generator
Build an RRULE, preview the dates, and export an .ics feed.
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Timers
Countdowns
Countdown maker
Countdown to any date. Shareable URL. Embeddable widget.
Open tool →Election countdown
Days until major democratic elections worldwide.
Open tool →Retirement countdown
Days until pension age by country, with a live counter.
Open tool →Olympic countdown
Live countdown to the next Summer and Winter Games.
Open tool →Spring countdown
Days until the vernal equinox, hemisphere-aware.
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Developer
Cron visualizer
Decode any cron expression. See the next runs and DST edge cases.
Open tool →Cron cheatsheet
Copy-ready cron for every common schedule, across 7 dialects.
Open tool →Cron timezone translator
Shift a crontab schedule between timezones without breaking it.
Open tool →AWS EventBridge cron converter
Convert standard cron to EventBridge's six-field syntax and back.
Open tool →GitHub Actions cron picker
Build a workflow schedule and copy the exact YAML cron line.
Open tool →Kubernetes CronJob validator
Validate a CronJob schedule and preview its upcoming run times.
Open tool →On-call rotation generator
Generate a fair pager rotation across a team. Export to calendar.
Open tool →JWT decoder
Decode header and claims locally. Highlights exp and iat in your timezone.
Open tool →Epoch & Unix timestamp converter
Seconds, ms, µs, ns and snowflake IDs to human dates, both ways.
Open tool →Date format converter
Paste any date, get ISO 8601, RFC 3339, SQL, epoch and language formats.
Open tool →Decimal day converter
Convert HH:MM:SS to a decimal fraction of a day and back.
Open tool →GPS time
Live GPS-UTC offset, GPS week number, and rollover history.
Open tool →Leap second history
Every UTC leap second since 1972 and what they fix.
Open tool →ISO 8601 converter
ISO 8601 dates, ISO week dates and PnYnMnD durations, both ways.
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Calendars
Multi-calendar converter
One Gregorian date shown in ten calendars at once. Share or embed.
Open tool →Hijri (Islamic) converter
Gregorian to Hijri and back. Ramadan and holiday markers.
Open tool →Hebrew calendar
Convert any Gregorian date to the Hebrew calendar and back.
Open tool →Chinese calendar
Lunar date, zodiac animal and the date of Chinese New Year.
Open tool →Jieqi solar terms
24 Chinese solar terms with dates, names and the current marker.
Open tool →Hindu calendar
Panchang, tithi and Vikram Samvat for any Gregorian date.
Open tool →Persian (Solar Hijri) calendar
Jalali date conversion both ways, with Nowruz markers.
Open tool →Buddhist era converter
Convert between Gregorian years and the Buddhist Era (Thai BE).
Open tool →Ethiopian calendar
Ge'ez calendar conversion both ways, including the thirteenth month.
Open tool →Japanese Wareki converter
Reiwa, Heisei and earlier nengo era years to and from Gregorian.
Open tool →Coptic calendar converter
Egyptian Christian calendar with Nayrouz, Nasie and Coptic Christmas.
Open tool →French Republican calendar
Revolutionary calendar converter with the decimal-time clock.
Open tool →Julian to Gregorian converter
Old Style and New Style dates for genealogy and history.
Open tool →Liturgical calendar
Western Christian church year: Lent, Easter, Advent and feast days.
Open tool →Religious holidays calendar
Major religious observances across traditions, 2026-2035.
Open tool →Easter date calculator
Western and Orthodox Easter dates with the computus explained.
Open tool →Lunar New Year dates
Chinese, Seollal, Tết and Tsagaan Sar dates, 2026-2035.
Open tool →Roman numerals date converter
Turn any date into Roman numerals for copyright lines and credits.
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Sun & moon
Sunrise & sunset times
Today's times plus a full-year daylight chart for any city.
Open tool →Moon phase calendar
Full, new and quarter moons for any month and location.
Open tool →Lunar month tracker
Current lunation, next new moon, next full moon and a 2026 table.
Open tool →Golden hour calculator
Sunrise, sunset, golden and blue hour for any place and date.
Open tool →Sun position calculator
Sun elevation, azimuth, live shadow length and the day's solar path.
Open tool →Daylight chart
Year-round daylight bands with equinox and solstice markers by city.
Open tool →Twilight times
Civil, nautical and astronomical twilight windows for any city.
Open tool →Tide times approximation
Simplified high and low tide estimates for 20 coastal cities. Not for navigation.
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Astronomy
Astronomical seasons
Equinox and solstice boundaries for both hemispheres, 2026-2030.
Open tool →Eclipse calendar
Solar and lunar eclipse dates and visibility, 2026-2030.
Open tool →Meteor shower calendar
Peak dates, rates and moonlight conditions, 2026-2030.
Open tool →Mercury retrograde dates
Retrograde windows 2026-2030 with a live countdown.
Open tool →Orbital periods
Sidereal vs synodic cycles for every planet in the solar system.
Open tool →Sidereal day clock
Solar vs star time and why a sidereal day is shorter.
Open tool →Time on Mars
Mars Coordinated Time plus live Curiosity and Perseverance sols.
Open tool →Light travel time
How long light takes to reach planets, stars and galaxies.
Open tool →Phenology bloom calendar
Cherry blossom, tulip, lavender and wisteria bloom windows.
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Science
Half-life calculator
Radioactive and exponential decay with cited isotope half-lives.
Open tool →Geological time scale
Eons, eras, periods and epochs from the Hadean to the Holocene.
Open tool →Time units converter
Jiffy, shake, lustrum, Planck time and deep-time units with citations.
Open tool →BPM converter
Beats per minute to milliseconds, note values, dotted notes and delay.
Open tool →Time signature chart
Music meters with beat counts, song examples, and citations.
Open tool →Reading time calculator
Words to minutes at your reading speed, for articles and scripts.
Open tool →Animal gestation calculator
Gestation and incubation periods for mammals and birds.
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Finance
Vesting cliff calculator
Map an equity grant's cliff and vesting schedule to real dates.
Open tool →Invoice due date calculator
Net 30/60/EOM terms into an exact due date. Skip weekends and holidays.
Open tool →Public domain calculator
When a work enters the public domain under US, UK and EU copyright term.
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HR & work
Hours calculator
Hours and minutes between two times, with breaks and pay. Timesheet-ready.
Open tool →Overtime calculator
Time-and-a-half and double-time pay from your rate and hours.
Open tool →Annual leave calculator
Pro-rata holiday entitlement for part-year and part-time work.
Open tool →Notice period calculator
Last working day and end date for 30, 60 or 90-day notice.
Open tool →Holiday pay calculator
Holiday pay and accrued entitlement under current UK rules.
Open tool →Tax year calculator
When the tax year starts and ends in the US, UK, India and Australia.
Open tool →School year calculator
UK, US, AU and CA term dates and days remaining in the school year.
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Legal
Statute of limitations calculator
Filing deadlines by US state and claim type. Informational, not legal advice.
Open tool →FMLA leave calculator
Track entitlement under the rolling 12-month method across leave events.
Open tool →Court deadline calculator
FRCP-correct filing deadlines: excludes the trigger day, rolls weekends and court holidays.
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Health
Sleep cycle calculator
Bedtimes and wake times aligned to 90-minute REM cycles.
Open tool →Pregnancy week calculator
Weeks, trimester, and due date from your last period or conception.
Open tool →Due date calculator
Your EDD from last period, conception, or IVF transfer, with trimester dates.
Open tool →Pet age calculator
Real dog and cat years by breed size, not the naive seven-to-one rule.
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Streaming
Netflix release time converter
When a show drops in your timezone. No more guessing the PT cutover.
Open tool →Disney+ release time
When new Marvel and Star Wars episodes land in your timezone.
Open tool →Prime Video release time
Catch Prime drops the moment they go live near you.
Open tool →HBO Max release time
House of the Dragon and more, in your local release time.
Open tool →Apple TV+ release time
When Severance and other Apple TV+ episodes unlock in your timezone.
Open tool →Anime simulcast converter
Turn a JST broadcast slot into your Crunchyroll simulcast time.
Open tool →Movie release dates by country
Theatrical release dates for major films, sorted by country.
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Sports
Life & fun
Age on other planets
Your age across the solar system, plus cosmic milestones.
Open tool →Life in weeks
A 90-year grid of your life, one square per week.
Open tool →Anniversary calculator
Years together, upcoming milestones, and the traditional gift each year.
Open tool →Wedding anniversary gifts
Traditional and modern gift themes for years 1-60, with citations.
Open tool →Wedding timeline planner
Checklist with due dates from your wedding date. Saves your progress.
Open tool →Birthstone by month
Birthstones, birth flowers and zodiac for every month.
Open tool →Zodiac & age lookup
Western and Chinese zodiac plus your current age from a birthday.
Open tool →What generation am I
Boomer, Gen X, Millennial, Gen Z, Gen Alpha from your birth year.
Open tool →Birthday paradox calculator
Probability that two people in a room share a birthday.
Open tool →Jet lag calculator
Recovery estimate from timezones crossed, plus a plan to reset faster.
Open tool →Flight duration calculator
Real flight time across timezones and how it shifts your body clock.
Open tool →Schengen 90/180 calculator
Track days used in the rolling 180-day window. See when you can return.
Open tool →Visa validity calculator
ESTA, ETIAS and ETA expiry and how long you can stay per entry.
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For remote workers
Best cities for remote workers
Ranked by timezone overlap, cost, internet, visa friendliness.
Open →Async communication guide
Long-form: how to do async-first work without burning your team out.
Open →Meeting cost calculator
Stop scheduling expensive meetings. See the dollar cost in real time.
Open →Hourly rate calculator
Freelancer rate calculator. Backs into target income with overhead and taxes.
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Don't see what you need?
Use the contact page with the tool you wish existed. We read reader requests and use them to decide which calculators, calendars, and guides to improve next.