80 tools

Calendars and date formats

80 free calendars and date formats tools, all running in your browser with no sign-up.

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Gregorian to Hijri date converterConvert any Gregorian date to its Hijri date in the official Saudi Umm al-Qura calendar, with the weekday and the Hijri month length.
Hijri to Gregorian date converterEnter a Hijri day, month and year to get the matching Gregorian date in the Umm al-Qura calendar, with the weekday and month length.
Gregorian to tabular Hijri converterConvert a Gregorian date to the arithmetic tabular Islamic calendar (30-year cycle), which works for any date since the Hijra in 622.
Tabular Hijri to Gregorian converterConvert a Hijri date to Gregorian with the arithmetic tabular Islamic calendar, suitable for historical dates from 1 AH up to 9000 AH.
Hijri year to Gregorian yearFind the Gregorian year or years a Hijri year falls in, with the dates of its first and last days and its length in Umm al-Qura.
Gregorian year to Hijri yearSee which Hijri years a Gregorian year covers, the Hijri date on 1 January and 31 December, and when the Islamic New Year falls in it.
Days between two Hijri datesCount the days between two Hijri dates in Umm al-Qura, plus the gap in Hijri years, months and days and the Gregorian date of each.
Hijri month lengths for a yearShow how many days each Hijri month has (29 or 30) in a chosen year of Umm al-Qura, with the Gregorian start and end of each month.
Hijri date todaySee today's Hijri date in the Umm al-Qura calendar, and how many days are left in the Hijri month and until the next Islamic New Year.
Age in Hijri years calculatorEnter your Gregorian birth date to get your age in Hijri years, months and days in Umm al-Qura, with your Gregorian age for comparison.
Age from Hijri birth dateEnter your Hijri birth date as on your ID to get your age in Hijri and Gregorian years, and your Gregorian birth date in Umm al-Qura.
Hijri birthday finderFind the Gregorian day your Hijri birthday falls on in a year you choose, and the Hijri age you turn on that day.
Hijri month calendar with Gregorian datesList every day of any Hijri month with its Gregorian date and weekday, following the Umm al-Qura calendar from 1300 to 1600 AH.
Ramadan dates by yearFind when Ramadan starts and ends in any Gregorian year from 1883 to 2173 in Umm al-Qura, with its length and the date of Eid al-Fitr.
Eid al-Fitr and Eid al-Adha dates by yearGet the dates of Eid al-Fitr, the Day of Arafah and Eid al-Adha in any Gregorian year from 1883 to 2173 in Umm al-Qura, with the weekday.
Islamic occasions for a Hijri yearGregorian dates of Islamic New Year, Ashura, Ramadan, Eid al-Fitr, the Day of Arafah, Eid al-Adha and the Tashreeq days for any Hijri year.
Add days to a Hijri dateAdd days to a Hijri date or subtract them to get the resulting date in Hijri and Gregorian, using the Umm al-Qura calendar.
Add Hijri months and years to a dateAdd Hijri years and months to a Hijri date to find the end date in Hijri and Gregorian, such as a contract, residency or subscription term.
White days (Ayyam al-Bid) datesFind the white days (13th, 14th and 15th of the Hijri month) as Gregorian dates in Umm al-Qura, with a table for the next 12 months.
Days until Ramadan and EidCount the days left until Ramadan, Eid al-Fitr, the Day of Arafah, Eid al-Adha, Islamic New Year or Ashura, based on the Umm al-Qura calendar.
Gregorian to Persian (Solar Hijri) date converterConvert any Gregorian date to the Solar Hijri (Persian) calendar used in Iran and Afghanistan, with the month name and weekday.
Persian (Solar Hijri) to Gregorian date converterEnter a Solar Hijri (Persian, Jalali) day, month and year to get the matching Gregorian date and the weekday.
Gregorian to Hebrew date converterFind the Hebrew calendar date for any Gregorian day from 1900 to 2100, with the month name and whether the year has 13 months.
Hebrew to Gregorian date converterConvert a Hebrew calendar date (day, month, year) to the Gregorian date and weekday, with Adar I and Adar II handled.
Gregorian to Coptic date converterFind the Coptic (Anno Martyrum) date for any Gregorian date, with the Coptic month name such as Thout, Koiak or Paremhat.
Coptic to Gregorian date converterEnter a Coptic day, month and Anno Martyrum year to get the matching Gregorian date and weekday, Nasie days included.
Gregorian to Ethiopian date converterConvert any Gregorian date to the Ethiopian calendar used officially in Ethiopia, with month names like Meskerem and Tahsas.
Ethiopian to Gregorian date converterEnter an Ethiopian year, month and day to get the Gregorian date and weekday, with the days of Pagume supported.
Gregorian to Indian national (Saka) date converterFind the Indian national (Saka) calendar date for any Gregorian day since 1957, with month names like Chaitra and Ashvina.
Indian national (Saka) to Gregorian date converterEnter a day, month and year in the Indian national Saka calendar to get the exact Gregorian date and weekday.
Gregorian to Thai Buddhist Era date converterConvert a Gregorian date to the Buddhist Era calendar used officially in Thailand, where the year is 543 more than the CE year.
Thai Buddhist Era to Gregorian date converterConvert a date written with the Thai Buddhist Era year, such as expiry dates on products and documents, to the Gregorian date.
Gregorian to Japanese era (Reiwa, Heisei) converterFind the Japanese era and era year for any Gregorian date since 1873, such as Reiwa, Heisei or Showa, with the Japanese form.
Japanese era to Gregorian date converterPick a Japanese era (Meiji to Reiwa), era year, month and day to get the Gregorian date, with each era's boundaries checked.
Gregorian to Chinese lunar date converterFind the Chinese lunar month and day for any Gregorian date, with leap months, the zodiac animal and the sexagenary year name.
Chinese lunar to Gregorian date converterConvert a Chinese lunar date, such as a traditional birthday or festival, to the Gregorian date, with leap months supported.
Gregorian to Julian calendar date converterConvert a Gregorian date to the Julian calendar used by some Orthodox churches and historical records, with the day gap between them.
Julian to Gregorian calendar date converterConvert a Julian (Old Style) date from historical records or a church calendar to the Gregorian date, weekday and Julian Day Number.
Gregorian to tabular Islamic (civil) date converterConvert a Gregorian date to the tabular (civil) Islamic calendar with its 30-year cycle, the basis used by many programs and references.
Tabular Islamic (civil) to Gregorian date converterEnter a date in the tabular civil Islamic calendar (30-year cycle) to get the matching Gregorian date and weekday.
Unix timestamp to date converterConvert a Unix timestamp in seconds to a UTC date and time, ISO 8601 and RFC 2822 text, plus the local time in any zone you pick.
Date to Unix timestamp converterTurn a date and time in any time zone into a Unix timestamp in seconds and milliseconds, with the ISO 8601 UTC form.
Unix milliseconds to date converterConvert a 13-digit Unix timestamp in milliseconds, as used by JavaScript and Java, to a UTC date and time with milliseconds.
Excel serial number to date converterConvert an Excel or Google Sheets serial date number, 1900 or 1904 system, to a date and time, handling the 1900 leap year bug.
Date to Excel serial number converterFind the serial number Excel or Google Sheets stores for any date and time, in the 1900 or 1904 system, with the time fraction.
Julian Day (JD) to date converterConvert an astronomical Julian Day number (JD) to a Gregorian UTC date and time, with the Julian calendar date and the MJD.
Date to Julian Day (JD) converterWork out the Julian Day (JD), Julian Day Number (JDN) and Modified Julian Date (MJD) for any date and time, with time zone support.
Modified Julian Date (MJD) to dateConvert a Modified Julian Date (MJD), as used in astronomy and satellite data, to a UTC date and time with the matching JD.
Unix timestamp to Excel date converterConvert a Unix timestamp in seconds to an Excel serial date in UTC or your zone, with a ready formula to paste into your sheet.
ISO 8601 to RFC 2822 converterConvert an ISO 8601 date such as 2026-10-01T09:30:00+03:00 to the RFC 2822 format used in email and RSS, plus a UTC version.
Discord snowflake ID to date converterFind when a Discord account, message or server was created from its snowflake ID, with support for X (Twitter) post IDs in the same format.
MongoDB ObjectId to date converterGet the creation date and time of a MongoDB document from its 24-character hex ObjectId, with the Unix timestamp, counter and random value.
Date to ISO week number converterGet the ISO 8601 week number of any date, with the ISO year, the full week date such as 2026-W40-4, the week range and day of year.
GPS week and seconds to date converterConvert a GPS week number and seconds of week to a UTC date and time, removing leap seconds automatically, with 10-bit week support.
Date to GPS week and seconds converterWork out the GPS week number and seconds of week for any date and time after 6 January 1980, with leap seconds and the 10-bit week.
Windows FILETIME to date converterConvert a Windows FILETIME value, decimal or hex, to a UTC date and time with 100-nanosecond precision, plus the other form and Unix time.
.NET ticks to date converterConvert a .NET DateTime.Ticks value, 100-nanosecond intervals since year 1, to a UTC date and time and a Unix timestamp.
Apple Cocoa timestamp to date converterConvert an Apple Cocoa or Core Data timestamp, seconds or nanoseconds since 2001-01-01 UTC, to a date, time and Unix timestamp.
LDAP timestamp to date (Active Directory)Convert an 18-digit Active Directory LDAP timestamp, such as lastLogonTimestamp, pwdLastSet or accountExpires, to a date and time.
Date to LDAP timestamp (Active Directory)Work out the 18-digit LDAP timestamp for any date and time, for Active Directory filters and accountExpires, with the hex form too.
12-hour to 24-hour time converterConvert any 12-hour time with AM or PM into 24-hour format and into 4-digit military time, including the tricky 12 AM and 12 PM cases.
24-hour to 12-hour time converterTurn a 24-hour time such as 17:30 into 12-hour clock format with AM or PM, and see the matching military time as well.
Military time to standard time converterEnter a 4-digit military time such as 1530 and get the standard 12-hour time, 3:30 PM, plus the 24-hour form with a colon.
Standard time to military time converterConvert a standard clock time such as 7:15 PM into 4-digit military time, 1915, and into 24-hour format with a colon.
Timecode to frames converterConvert a video timecode in HH:MM:SS:FF form into a frame count and the real running time in seconds, including 29.97 drop-frame.
Frames to timecode converterTurn a frame number or frame count into SMPTE timecode (HH:MM:SS:FF) at your frame rate, with drop-frame handled at 29.97 and 59.94.
RFC 2822 to ISO 8601 date converterConvert an RFC 2822 date from an email header or RSS feed, such as Thu, 01 Oct 2026 09:30:00 +0300, into ISO 8601, UTC and a Unix timestamp.
Hours to days, hours and minutesBreak a large number of hours, such as 50 or 100.5, into days, hours and minutes, and see the same span in decimal days.
YYYYMMDD to readable date converterTurn an 8-digit compact date such as 20261225 into DD/MM/YYYY, ISO 8601 and a long date with the weekday and month name.
MM/DD/YYYY to ISO 8601 date (YYYY-MM-DD)Convert a US-style MM/DD/YYYY date into ISO 8601 YYYY-MM-DD and the compact YYYYMMDD form, with the weekday so you can double-check it.
Milliseconds to readable durationTurn a millisecond count into a readable duration in days, hours, minutes, seconds and milliseconds, plus HH:MM:SS.mmm format.
ISO 8601 duration to readable textDecode an ISO 8601 duration such as P1DT2H30M or PT45M into plain words, with total seconds and hours when the length is fixed.
Duration to ISO 8601 formatEnter years, months, days, hours, minutes and seconds to build an ISO 8601 duration such as P1DT2H30M, with an option to carry overflow.
Decimal minutes to minutes and secondsConvert decimal minutes such as 2.75 into minutes and seconds in M:SS format (2:45), handy for running pace, clip lengths and call times.
DD/MM/YYYY to MM/DD/YYYY date converterSwitch a day-first date (DD/MM/YYYY) to the US month-first format MM/DD/YYYY, with the ISO form and the weekday to double-check.
MM/DD/YYYY to DD/MM/YYYY date converterConvert a US-style MM/DD/YYYY date into the day-first DD/MM/YYYY format used across the Arab world and Europe, with ISO and weekday.
DD/MM/YYYY to ISO 8601 date (YYYY-MM-DD)Convert a DD/MM/YYYY date into standard ISO 8601 YYYY-MM-DD and compact YYYYMMDD form, with the weekday as a check.
ISO date (YYYY-MM-DD) to DD/MM/YYYYTurn an ISO date in YYYY-MM-DD form into DD/MM/YYYY, the US MM/DD/YYYY form, and a long date with the weekday and month name.
Time to decimal fraction of a dayConvert a clock time such as 18:00 into a decimal fraction of the day (0.75), the way Excel stores times, plus the percent of the day.
Decimal day fraction to timeTurn a decimal such as 0.75 or an Excel time value into a clock time in HH:MM:SS and 12-hour form, with any whole days counted.