# Julian to gregorian calculator

## World's simplest time tool

With this browser-based application, you can convert any date from the ancient Julian calendar to the modern Gregorian calendar that we use today. You can paste several Julian dates into the input and calculate the corresponding Gregorian calendar dates in the output. If you enter several Julian dates (one per line), you can instantly see the difference in days between both calendars. Additionally, you can change the Gregorian calendar date format in the options. Created by computer nerds from team Browserling.
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Gregorian Date Format
Choose the output Gregorian date format.
Create a custom date format using abbreviations. (Activated by selecting custom mode).
Custom Date Format Cheat Sheet
If you selected the "custom" date format in the previous option, then here's a cheat sheet for creating your own dates: • YYYY/YY – year, • MMMM/MMM/MM – month, • dddd/ddd – day of week, • DD – day, • hh – hour, • mm – minute, • ss – second.
Use zero-padded components in the output Gregorian dates.
Use 12-hour time parts in the output Gregorian dates.
Julian to gregorian calculator tool What is a julian to gregorian calculator?
This is a quick online utility for calculating the Gregorian calendar date from the given Julian calendar date. The Julian calendar was introduced on January 1, 45 BC by Julius Caesar. In this calendar, the length of the year was 365¼ days, which means every four years the extra quarter of the day formed an additional day. A year with this extra day, by the way, is called a leap year. In 1582, the Julian calendar was replaced by the Gregorian calendar, which is the modern calendar that we use today. The Gregorian calendar is astronomically more accurate and the year lasts 365.2425 days. In the Gregorian calendar, years that are divisible by 4 are considered leap years, with the exception of years that are divisible by 100 and not divisible by 400. For example, the years 2100, 2200, 2300, and 2400 in the Gregorian calendar have 365, 365, 365, and 366 days (only the year 2400 is a leap year with an extra calendar day), however, in the Julian calendar, they have 366, 366, 366, and 366 days (there are 4 extra calendar days). It means that for every 400 years, the Gregorian calendar drifts ahead of the Julian calendar by 3 days. This is also the key reason why the Julian calendar was replaced by the Gregorian version. In this program, we implemented a precise mathematical algorithm that converts any date from one calendar standard to the other. Once you enter a Julian date in the format "YYYY-MM-DD" in the input, you'll get a Gregorian date in the output. Our tool can also convert multiple dates at once if you enter them in a column, one after another on separate lines. You can choose the Gregorian date format for the output by selecting a format from the list in the options or by creating a custom date format from a template using date component abbreviations (see the abbreviations cheat sheet in the options). You can also add or remove date padding (so that all date components are 2 or 4 digits long) and turn the time part into a 12-hour or 24-hour clock format. If you need to perform the reverse operation and convert a modern Gregorian date to the older Julian calendar, you can use our Gregorian to Julian Date Calculator utility. Timeabulous!
Julian to gregorian calculator examples Click to use
Wikipedia Launch Date
This example takes a Julian calendar date 2001-01-02 as the input and converts it to a Gregorian calendar date. In the output, we get 2001-01-15 and it's an important date, as on this day, Wikipedia was created. As you can see, the difference between both calendar dates is 13 days. In fact, all dates from Feb 29, 1900 to Feb 28, 2100 of the Julian calendar (which correspond to the dates from Mar 13, 1900 to Mar 13, 2100 of the Gregorian calendar) have a difference of 13 days as compared to the Gregorian calendar.
2001-01-02
2001-01-15
Required options
These options will be used automatically if you select this example.
Choose the output Gregorian date format.
Create a custom date format using abbreviations. (Activated by selecting custom mode).
Use zero-padded components in the output Gregorian dates.
Use 12-hour time parts in the output Gregorian dates.
Reform by Pope Gregory XIII
In this example, we go back in time when the transition from the Julian calendar to the Gregorian calendar was announced. The reform in the 16h century by Pope Gregory XIII shifted the calendar by 10 days. Namely, Thursday, October 4, 1582 (still in the Julian calendar) was followed by Friday, October 15, 1582 (now the Gregorian calendar) and October 5 to October 14 were skipped. In the output, we print the Gregorian date for the day that follows the final Julian calendar day in a custom format, and we also include the day of the week.
1582-10-05
Fri, October 15, 1582
Required options
These options will be used automatically if you select this example.
Choose the output Gregorian date format.
Create a custom date format using abbreviations. (Activated by selecting custom mode).
Use zero-padded components in the output Gregorian dates.
Use 12-hour time parts in the output Gregorian dates.
Difference in Days Between Calendars
In the input of this example, we enter multiple Julian calendar dates that are all 400 years apart. We start the dates at "400-01-01 06:00:00" and end the list with the date "2400-01-01 00:00:00". The output shows that the difference in the number of days between both calendars grows as the years increase. To be precise, every 400 years the difference between the Julian and Gregorian calendars increases by 3 days. In the output, we remove the padding and display the clock time (which doesn't change between calendars) in a 12-hour format.
400-01-01 06:00:00 800-01-01 00:00:00 1200-01-01 18:00:00 1600-01-01 12:00:00 2000-01-01 06:00:00 2400-01-01 00:00:00
400-1-2 6:0:0 am 800-1-5 0:0:0 am 1200-1-8 6:0:0 pm 1600-1-11 12:0:0 pm 2000-1-14 6:0:0 am 2400-1-17 0:0:0 am
Required options
These options will be used automatically if you select this example.
Choose the output Gregorian date format.
Create a custom date format using abbreviations. (Activated by selecting custom mode).
Use zero-padded components in the output Gregorian dates.
Use 12-hour time parts in the output Gregorian dates.
Pro tips Master online time tools
You can pass input to this tool via ?input query argument and it will automatically compute output. Here's how to type it in your browser's address bar. Click to try!
All time tools
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Quickly visualize your life in weeks or months.
Quickly print a list of neat-looking clock times (such as 10:11:12).
Quickly print a list of neat-looking calendar dates (such as 2055-05-05).
Quickly convert clock time in H:M:S format to seconds.
Quickly convert seconds to clock time in H:M:S format.
Quickly convert time in 24 hour format to 12 hour format.
Quickly convert time in 12 hour format to 24 hour format.
Quickly find how many seconds have passed since midnight.
Quickly find how many seconds are left till midnight.
Quickly find the difference between two clock times.
Quickly find the difference between two calendar dates.
Quickly find the age difference between two or more people.
Quickly add hours, minutes, and seconds to the given time.
Quickly subtract hours, minutes, and seconds from the given time.
Quickly add days, months, and years to the given date.
Quickly subtract days, months, and years to from the given date.
Quickly change the current time format to any new format.
Quickly change the current date format to any new format.
Quickly round the given clock time up or down.
Quickly round the given calendar date up or down.
Quickly drop seconds and minutes from a clock time.
Quickly drop days and months from a calendar date.
Quickly sort clock times in ascending or descending order.
Quickly sort calendar dates in ascending or descending order.
Quickly check if the given clock time is valid.
Quickly check if the given calendar date is valid.
Quickly find how many hours are in the given days.
Quickly find how many days are in the given hours.
Quickly find the astrological sign by the birthday or any date.
Quickly print a list of the dates of all astrological signs.
Quickly find the average value of multiple clock times.
Quickly find the average value of multiple calendar dates.
Quickly generate a list of random clock times.
Quickly generate a list of random calendar dates.
Quickly create a list of clock times that match your criteria.
Quickly generate a list of calendar dates that match your criteria.
Quickly split the given time period into multiple intervals.
Quickly split the given date period into multiple intervals.
Quickly generate increasing or decreasing clock times.
Quickly generate increasing or decreasing calendar dates.
Quickly print a list of all leap years.
Quickly print a list of all common years.
Quickly test if the given year is a leap year.
Quickly test if the given year is a common year.
Quickly find how old a cat would be if it was a human.
Quickly find how old a human would be if he/she was a cat.
Quickly find how old a dog would be if it was a human.
Quickly find how old a human would be if it was a dog.
Quickly convert a modern Gregorian date to a Julian date.
Quickly convert an ancient Julian date to a Gregorian date.
Quickly calculate the Julian day number for any calendar date.
Quickly convert the Julian day to a regular calendar date.
Quickly print a list of all Easter dates for all years.
Quickly convert a UNIX Epoch time to a human-readable time.
Quickly convert human-readable time to a UNIX Epoch time.
Quickly generate increasing or decreasing UNIX timestamps.
Quickly generate one or more random UNIX Epoch times.
Quickly convert a HH:MM:SS clock to a military HHMM clock.
Quickly convert a military clock HHMM to a HH:MM:SS clock.
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Create a GIF animation of an analog clock.
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Animate a timeless clock that goes in an infinite spiral.
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Visualize the given clock time as a pie chart.
Draw Current Year as a Pie Chart
Visualize the current year as a pie chart.
Draw Time as a Bar Chart
Visualize the given clock time as a bar chart.
Draw Current Year as a Bar Chart
Visualize the current year as a bar chart.
Draw a Time Arrow
Visualize the given clock time as an arrow.
Visualize Time Intervals
Draw a visualization of multiple time intervals.
Visualize Time Series
Draw a time series chart.
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Print the season (winter, spring, summer, autumn) by a date.
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Swap a clock's hour hand with minute hand.
Reverse Clock Time
Find the reverse of the given clock time.
Invert Clock Time
Find the inverse of the given clock time.
Shift Clock Time
Shift the given clock time by any time interval.
Change Clock Scale
Change the clock scale from 24 hours to any other hours.
Generate Valid Clock Times
Generate a list of valid clock times.
Generate Invalid Clock Times
Generate a list of invalid clock times.
Generate Valid Calendar Dates
Generate a list of valid calendar dates.
Generate Invalid Calendar Dates
Generate a list of invalid calendar dates.
Convert English to Crontab
Create a crontab expression from human language.
Convert Crontab to English
Rewrite a crontab entry into human language.
Convert Seconds To Minutes
Find how many minutes are in the given seconds.
Convert Seconds To Hours
Find how many hours are in the given seconds.
Convert Seconds to Days
Find how many days are in the given seconds.
Convert Seconds to Weeks
Find how many weeks are in the given seconds.
Convert Seconds to Months
Find how many months are in the given seconds.
Convert Seconds to Years
Find how many years are in the given seconds.
Convert Minutes to Seconds
Find how many seconds are in the given minutes.
Convert Minutes To Hours
Find how many hours are in the given minutes.
Convert Minutes to Days
Find how many days are in the given minutes.
Convert Minutes to Weeks
Find how many weeks are in the given minutes.
Convert Minutes to Months
Find how many months are in the given minutes.
Convert Minutes to Years
Find how many years are in the given minutes.
Convert Hours To Seconds
Find how many seconds are in the given hours.
Convert Hours to Minutes
Find how many minutes are in the given hours.
Convert Hours to Weeks
Find how many weeks are in the given hours.
Convert Hours to Months
Find how many months are in the given hours.
Convert Hours to Years
Find how many years are in the given hours.
Convert Days to Seconds
Find how many seconds are in the given days.
Convert Days to Minutes
Find how many minutes are in the given days.
Convert Days to Weeks
Find how many weeks are in the given days.
Convert Days to Months
Find how many months are in the given days.
Convert Days to Years
Find how many years are in the given days.
Convert Weeks to Seconds
Find how many seconds are in the given weeks.
Convert Weeks To Minutes
Find how many minutes are in the given weeks.
Convert Weeks To Hours
Find how many hours are in the given weeks.
Convert Weeks to Days
Find how many days are in the given weeks.
Convert Weeks to Months
Find how many months are in the given weeks.
Convert Weeks to Years
Find how many years are in the given weeks.
Convert Months to Seconds
Find how many seconds are in the given months.
Convert Months To Minutes
Find how many minutes are in the given months.
Convert Months To Hours
Find how many hours are in the given months.
Convert Months to Days
Find how many days are in the given months.
Convert Months to Weeks
Find how many weeks are in the given months.
Convert Months to Years
Find how many years are in the given months.
Convert Years to Seconds
Find how many seconds are in the given years.
Convert Years To Minutes
Find how many minutes are in the given years.
Convert Years To Hours
Find how many hours are in the given years.
Convert Years to Days
Find how many days are in the given years.
Convert Years to Weeks
Find how many weeks are in the given years.
Convert Years to Months
Find how many months are in the given years.
Find Week of the Year
Given a calendar date, find which week of the year it is.
Find Day of the Year
Given a calendar date, find which day of the year it is.
Find Day of the Week
Given a calendar date, find which day of the week it is.
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Find how old a human would be if he/she was a bird.
Convert a Human's Age to Bird Years
Find how old a bird would be if it was a human.
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Convert clock time on Earth to clock time on Mars.
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Print a list of symmetric clock times.
Generate Palindromic Dates
Print a list of symmetric calendar dates.
Generate Equal H:M:S Times
Print a list of clock times with hrs equal mins equal secs.
Generate Equal Y-M-D Dates
Print a list of calendar dates with yr equal mon equal day.
Calculate Clock Hand Angle
Find the angle between hour hand and minute hand.
Set Clock Hand Angle
Print a list of all clock times with a specific hand angle.
Set Straight Clock Hands
Print a list of all clock times when hands are in a straight line.
Normalize Clock Times
Given clock times in various formats, convert them to one format.
Normalize Calendar Dates
Given calendar dates in various formats, make them the same format.
Spell Clock Times
Write out clock times in full text format.
Spell Calendar Dates
Write out calendar dates in full text format.
Rotate Clock Times
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Rotate Calendar Dates
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Freeform Time Calculator
Perform freeform clock time arithmetics.
Freeform Date Calculator
Perform freeform calendar date arithmetics.
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