All tools
Pick the right one for the job. Each tool runs in your browser, ships with a shareable URL, and an embed snippet you can drop into any site.
Compare cities side-by-side. Every row editable. Share or embed.
Open tool →Live clocks for any cities. Business-hour ring. Local persistence.
Open tool →Find the best overlap across timezones. Heatmap + top 3 slots.
Open tool →Who is online now and the best hour for a named team with individual hours.
Open tool →Interactive world map of every UTC offset, half-hour and 45-minute zones included.
Open tool →NATO phonetic letter codes from Zulu to Yankee, with each zone's UTC offset.
Open tool →Typical office start and end times and weekly averages around the world.
Open tool →Which countries observe, abolished, or are debating daylight saving time.
Open tool →Per-country daylight saving adoption, abolition, and clock-change reforms.
Open tool →Years, months, ticking seconds. Dog years and milestones too.
Open tool →Calendar days, weekdays, business days with optional holidays.
Open tool →Add or subtract years, months, weeks, days. Business-day mode.
Open tool →Skip weekends and per-country public holidays.
Open tool →How much of the work year has elapsed, by country calendar.
Open tool →Live counter from any past date and time.
Open tool →ISO and US week numbers. Reference table for the year.
Open tool →Whether the week starts Monday, Sunday, or Saturday, country by country.
Open tool →Day-of-week lookup for any historical or future date.
Open tool →Visual full-year calendar with holidays, weekends, and PNG export.
Open tool →Live percent of the year, quarter, month, and week elapsed.
Open tool →When does a century or millennium really start: 2000 or 2001?
Open tool →Check if any year is a leap year and count leap years in a range.
Open tool →Build an RRULE, preview the dates, and export an .ics feed.
Open tool →Countdown to any date. Shareable URL. Embeddable widget.
Open tool →Days until major democratic elections worldwide.
Open tool →Days until pension age by country, with a live counter.
Open tool →Live countdown to the next Summer and Winter Games.
Open tool →Days until the vernal equinox, hemisphere-aware.
Open tool →Decode any cron expression. See the next runs and DST edge cases.
Open tool →Copy-ready cron for every common schedule, across 7 dialects.
Open tool →Shift a crontab schedule between timezones without breaking it.
Open tool →Convert standard cron to EventBridge's six-field syntax and back.
Open tool →Build a workflow schedule and copy the exact YAML cron line.
Open tool →Validate a CronJob schedule and preview its upcoming run times.
Open tool →Generate a fair pager rotation across a team. Export to calendar.
Open tool →Decode header and claims locally. Highlights exp and iat in your timezone.
Open tool →Seconds, ms, µs, ns and snowflake IDs to human dates, both ways.
Open tool →Paste any date, get ISO 8601, RFC 3339, SQL, epoch and language formats.
Open tool →Convert HH:MM:SS to a decimal fraction of a day and back.
Open tool →Live GPS-UTC offset, GPS week number, and rollover history.
Open tool →Every UTC leap second since 1972 and what they fix.
Open tool →ISO 8601 dates, ISO week dates and PnYnMnD durations, both ways.
Open tool →One Gregorian date shown in ten calendars at once. Share or embed.
Open tool →Gregorian to Hijri and back. Ramadan and holiday markers.
Open tool →Convert any Gregorian date to the Hebrew calendar and back.
Open tool →Lunar date, zodiac animal and the date of Chinese New Year.
Open tool →24 Chinese solar terms with dates, names and the current marker.
Open tool →Panchang, tithi and Vikram Samvat for any Gregorian date.
Open tool →Jalali date conversion both ways, with Nowruz markers.
Open tool →Convert between Gregorian years and the Buddhist Era (Thai BE).
Open tool →Ge'ez calendar conversion both ways, including the thirteenth month.
Open tool →Reiwa, Heisei and earlier nengo era years to and from Gregorian.
Open tool →Egyptian Christian calendar with Nayrouz, Nasie and Coptic Christmas.
Open tool →Revolutionary calendar converter with the decimal-time clock.
Open tool →Old Style and New Style dates for genealogy and history.
Open tool →Western Christian church year: Lent, Easter, Advent and feast days.
Open tool →Major religious observances across traditions, 2026-2035.
Open tool →Western and Orthodox Easter dates with the computus explained.
Open tool →Chinese, Seollal, Tết and Tsagaan Sar dates, 2026-2035.
Open tool →Turn any date into Roman numerals for copyright lines and credits.
Open tool →Today's times plus a full-year daylight chart for any city.
Open tool →Full, new and quarter moons for any month and location.
Open tool →Current lunation, next new moon, next full moon and a 2026 table.
Open tool →Sunrise, sunset, golden and blue hour for any place and date.
Open tool →Sun elevation, azimuth, live shadow length and the day's solar path.
Open tool →Year-round daylight bands with equinox and solstice markers by city.
Open tool →Civil, nautical and astronomical twilight windows for any city.
Open tool →Simplified high and low tide estimates for 20 coastal cities. Not for navigation.
Open tool →Equinox and solstice boundaries for both hemispheres, 2026-2030.
Open tool →Solar and lunar eclipse dates and visibility, 2026-2030.
Open tool →Peak dates, rates and moonlight conditions, 2026-2030.
Open tool →Retrograde windows 2026-2030 with a live countdown.
Open tool →Sidereal vs synodic cycles for every planet in the solar system.
Open tool →Solar vs star time and why a sidereal day is shorter.
Open tool →Mars Coordinated Time plus live Curiosity and Perseverance sols.
Open tool →How long light takes to reach planets, stars and galaxies.
Open tool →Cherry blossom, tulip, lavender and wisteria bloom windows.
Open tool →Radioactive and exponential decay with cited isotope half-lives.
Open tool →Eons, eras, periods and epochs from the Hadean to the Holocene.
Open tool →Jiffy, shake, lustrum, Planck time and deep-time units with citations.
Open tool →Beats per minute to milliseconds, note values, dotted notes and delay.
Open tool →Music meters with beat counts, song examples, and citations.
Open tool →Words to minutes at your reading speed, for articles and scripts.
Open tool →Gestation and incubation periods for mammals and birds.
Open tool →Map an equity grant's cliff and vesting schedule to real dates.
Open tool →Net 30/60/EOM terms into an exact due date. Skip weekends and holidays.
Open tool →When a work enters the public domain under US, UK and EU copyright term.
Open tool →Hours and minutes between two times, with breaks and pay. Timesheet-ready.
Open tool →Time-and-a-half and double-time pay from your rate and hours.
Open tool →Pro-rata holiday entitlement for part-year and part-time work.
Open tool →Last working day and end date for 30, 60 or 90-day notice.
Open tool →Holiday pay and accrued entitlement under current UK rules.
Open tool →When the tax year starts and ends in the US, UK, India and Australia.
Open tool →UK, US, AU and CA term dates and days remaining in the school year.
Open tool →Filing deadlines by US state and claim type. Informational, not legal advice.
Open tool →Track entitlement under the rolling 12-month method across leave events.
Open tool →FRCP-correct filing deadlines: excludes the trigger day, rolls weekends and court holidays.
Open tool →Bedtimes and wake times aligned to 90-minute REM cycles.
Open tool →Weeks, trimester, and due date from your last period or conception.
Open tool →Your EDD from last period, conception, or IVF transfer, with trimester dates.
Open tool →Real dog and cat years by breed size, not the naive seven-to-one rule.
Open tool →When a show drops in your timezone. No more guessing the PT cutover.
Open tool →When new Marvel and Star Wars episodes land in your timezone.
Open tool →Catch Prime drops the moment they go live near you.
Open tool →House of the Dragon and more, in your local release time.
Open tool →When Severance and other Apple TV+ episodes unlock in your timezone.
Open tool →Turn a JST broadcast slot into your Crunchyroll simulcast time.
Open tool →Theatrical release dates for major films, sorted by country.
Open tool →Your age across the solar system, plus cosmic milestones.
Open tool →A 90-year grid of your life, one square per week.
Open tool →Years together, upcoming milestones, and the traditional gift each year.
Open tool →Traditional and modern gift themes for years 1-60, with citations.
Open tool →Checklist with due dates from your wedding date. Saves your progress.
Open tool →Birthstones, birth flowers and zodiac for every month.
Open tool →Western and Chinese zodiac plus your current age from a birthday.
Open tool →Boomer, Gen X, Millennial, Gen Z, Gen Alpha from your birth year.
Open tool →Probability that two people in a room share a birthday.
Open tool →Recovery estimate from timezones crossed, plus a plan to reset faster.
Open tool →Real flight time across timezones and how it shifts your body clock.
Open tool →Track days used in the rolling 180-day window. See when you can return.
Open tool →ESTA, ETIAS and ETA expiry and how long you can stay per entry.
Open tool →Ranked by timezone overlap, cost, internet, visa friendliness.
Open →Long-form: how to do async-first work without burning your team out.
Open →Stop scheduling expensive meetings. See the dollar cost in real time.
Open →Freelancer rate calculator. Backs into target income with overhead and taxes.
Open →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.