Date & Time
Free Date & Time calculators with instant results, clear explanations and worked examples — no sign-up, available in 9 languages.
Count the days, weeks or years between two dates, find your age to the day, add business days, convert time zones and work out deadlines. These come in handy for planning events, tracking anniversaries and milestones, or answering “how long until…” and “what date is…” without flipping through a calendar.
All Date & Time calculators
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Anniversary Countdown Calculator
How long you've been together down to the day, the traditional gift for each year, and a countdown to your next anniversary.
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Business Days Calculator
Count working days between two dates, excluding weekends and US/UK public holidays, or add and subtract business days. Custom holidays and calendar view.
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Chinese Calendar Converter & Zodiac Year
Convert any Gregorian date to the Chinese lunisolar calendar. See the lunar month and day, leap months, the stem-branch year, and your Chinese zodiac animal.
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Ethiopian Calendar Converter & Date Today
Convert dates between the Ethiopian (Geez) and Gregorian calendars, both ways. Shows the weekday, the 13-month layout, and today’s Ethiopian date.
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Hebrew Date Converter
Convert any Gregorian date to the Hebrew (Jewish) calendar — year in Anno Mundi, month name, day and weekday. Shows the Adar I/II leap month and today’s date.
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Hijri Age Calculator
Enter your Gregorian birth date to find your exact age in the Islamic (Hijri) calendar, your Gregorian age, and why your Hijri age is about 3% higher.
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Hijri Date Converter
Convert dates between the Islamic (Hijri) and Gregorian calendars, both ways. Shows the weekday, today’s Hijri date, and the tabular vs moon-sighting note.
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Julian Calendar Converter (Old Style ⇄ New)
Convert dates between the Julian (Old Style) and Gregorian (New Style) calendars, both ways. Shows the weekday and why Orthodox Christmas falls on 7 January.
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Meeting Timezone Calculator
Find the fairest meeting time for a global team. Enter each person's UTC offset and rank every slot by how evenly it shares the off-hours burden.
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Nth Weekday of the Month Finder
Find the exact date of the 1st–5th or last Monday, Thursday, etc. in any month and year — like the 3rd Thursday of November.
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Persian (Solar Hijri) Calendar Converter
Convert dates between the Persian (Solar Hijri / Jalali / Shamsi) and Gregorian calendars, both ways. Shows the weekday, today's Shamsi date and Nowruz.
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Project Deadline Planner
Deadline planner — schedule project phases in working days, skip weekends and holidays, and check if you'll hit the deadline with a Gantt timeline.
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Ramadan Fasting Hours Calculator
Find your Ramadan fasting hours (Fajr to Maghrib) for any city and year. Day-1, mid and last-day fast length, plus the average, with prayer-time methods.
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Saka Calendar Converter (Indian National)
Convert dates between the Indian national (Saka) calendar and Gregorian, both ways. Shows the weekday, today’s Saka date, and Rashtriya Panchang rules.
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Time Card Calculator with Overtime
Add up weekly hours from clock-in/out times, subtract breaks, and calculate overtime and pay with your own rules — FLSA & California defaults built in. Free.
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Your Age in 8 Calendars
Find your exact age in the Islamic (Hijri), Gregorian, Hebrew, Persian, Julian, Saka, Ethiopian and Chinese calendars, and convert dates into all 8.
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