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gregorian to julian calculator

world's simplest time tool

With this browser-based application, you can convert any date from the Gregorian calendar (that we currently use) to the older Julian calendar. You can enter multiple dates from different centuries as the input and see how the Gregorian dates compare to the Julian dates. You can change the Julian date format in the output and display the clock time in 12hr or 24hr format. Additionally, you can find the Julian day for each date with arbitrary precision. Created by computer nerds from team Browserling.

᠎᠎᠎          Tool Options

Julian Date Format

Select the Julian date format.
Use a custom date pattern.
(Select custom mode first).
• YYYY/YY – year,
• MMMM/MMM/MM – month,
• dddd/ddd – day of week,
• DD – day, • hh – hour,
• mm – minute, • ss – second.

Julian Day Number

Print the continuous count of
days since the beginning
of the Julian period.
Set the precision of a Julian day.

Padding and Clock Format

Display full-width dates in
the Julian calendar. (All
components will be printed
with padding).
Display Julian dates with
a 12-hour clock time part.

What is a gregorian to julian calculator?

This is a quick online utility for calculating the Julian calendar date from the given Gregorian calendar date. If you didn't know, the Gregorian calendar is the modern calendar that we use today and the Julian calendar is the older calendar with an error that we used a couple of hundred years ago. In the modern Gregorian calendar, a year lasts 365.2425 days. This means that a common year consists of 365 days, and every 4 years there's a leap year consisting of 366 days (with an exception of the years that are divisible by 100 and not divisible by 400 years). The Julian calendar is less precise, and according to it, the year consists of 365.25 days, which means that every 4th year is a leap year. As a result, every 400 years the Gregorian and Julian calendars shift by 3 days. Our calculator allows you to convert any date from the Gregorian calendar to the Julian calendar. For example, if you enter the current calendar date as the input, such as 2022-05-06, you'll get 2022-04-23 as the Julian calendar date as the output. By activating the checkbox in the options, you can also display the Julian day. The Julian day is a continuous count of the days that have passed since the noon of January 1, -4712 (in Julian calendar), which is the same as November 24, -4713 (in Gregorian calendar). For example, the Julian day (JD) for the current calendar date 2022-05-06 is 2459705.5. You can control the accuracy of the Julian day in the options by specifying the number of digits in the decimal part. You can also customize the Julian date output format by printing the clock time, day of the week, and spelled months. If necessary, you can also create a custom output date format by switching to the custom templating mode and creating a date template using the YYYY, MM, DD, etc. notation that you can find in the options. Finally, if the calendar date has a time part, then you can change the 24-hour time to a 12-hour time (or the other way around) and control the padding of clock digits. Timeabulous!


Gregorian to julian calculator examples

Click to try

Turn a Gregorian Date into a Julian Date

In this example, we load January 15th, 2010 as the input, which is the day of the longest solar eclipse of the 21st century. We convert this Gregorian date to the Julian calendar and get the date 2010-01-02 in the output. As we can see, the difference between the Gregorian and Julian calendars in 2010 is 13 days.

2010-01-15
2010-01-02
Required options
These options will be used automatically if you select this example.
Select the Julian date format.
Use a custom date pattern.
(Select custom mode first).
Print the continuous count of
days since the beginning
of the Julian period.
Set the precision of a Julian day.
Display full-width dates in
the Julian calendar. (All
components will be printed
with padding).
Display Julian dates with
a 12-hour clock time part.

Differences in Gregorian and Julian Dates

In this example, we convert multiple dates from each century of the Gregorian calendar to the Julian calendar. We start with the date 2000-06-30 and decrease each date by 100 years. The first year 2000 is divisible by 100 and 400, so it is a leap year in both calendars. The following 3 years (1900, 1800, 1700) are common years in the Gregorian calendar but they are leap years in the Julian calendar, so they shift by one calendar day. If you look closely, then every 4 input dates (which span over 400 years) are shifted by 3 days in the output dates. We also display the Julian day for each output date and use a custom output date format.

2000-06-30 1900-06-30 1800-06-30 1700-06-30 1600-06-30 1500-06-30 1400-06-30 1300-06-30 1200-06-30 1100-06-30 1000-06-30 900-06-30 800-06-30 700-06-30 600-06-30 500-06-30 400-06-30 300-06-30 200-06-30
17 June 2000, JD = 2451725.5 17 June 1900, JD = 2415200.5 18 June 1800, JD = 2378676.5 19 June 1700, JD = 2342152.5 20 June 1600, JD = 2305628.5 20 June 1500, JD = 2269103.5 21 June 1400, JD = 2232579.5 22 June 1300, JD = 2196055.5 23 June 1200, JD = 2159531.5 23 June 1100, JD = 2123006.5 24 June 1000, JD = 2086482.5 25 June 900, JD = 2049958.5 26 June 800, JD = 2013434.5 26 June 700, JD = 1976909.5 27 June 600, JD = 1940385.5 28 June 500, JD = 1903861.5 29 June 400, JD = 1867337.5 29 June 300, JD = 1830812.5 30 June 200, JD = 1794288.5
Required options
These options will be used automatically if you select this example.
Select the Julian date format.
Use a custom date pattern.
(Select custom mode first).
Print the continuous count of
days since the beginning
of the Julian period.
Set the precision of a Julian day.
Display full-width dates in
the Julian calendar. (All
components will be printed
with padding).
Display Julian dates with
a 12-hour clock time part.

Start of the Julian Day

In this example, we find the beginning of the Julian Period, when the Julian day (JD) is equal to 0. According to the Gregorian calendar, this date falls on the noon of Nov 24, 4714 BC (which is the same date as Nov 24, -4713 – notice how a "BC" date is offset by one compared to a negative date). We paste this date into the input field as the first date and then increment the following dates by various amounts to show you various interesting JD numbers ranging from 0 to 10,000,000. To put these numbers in perspective, we add a recent 21st-century date at the end of the list, which has the Julian day count of 2451673.3014 (the precision is 4). We don't use padding in the example, but we do show the time part of the date, which, by the way, is the same in both the Gregorian and Julian calendars.

-4713-11-24 12:00:00 -4713-11-24 18:00:00 -4713-11-25 00:00:00 -4713-11-25 12:00:00 -4712-03-03 12:00:00 -4710-08-20 12:00:00 -4685-04-12 12:00:00 -4439-09-09 12:00:00 -1975-10-21 12:00:00 22666-12-20 12:00:00 2000-05-08 19:14:00
-4712-1-1 12:0:0, JD = 0 -4712-1-1 18:0:0, JD = 0.25 -4712-1-2 0:0:0, JD = 0.5 -4712-1-2 12:0:0, JD = 1 -4712-4-10 12:0:0, JD = 100 -4710-9-27 12:0:0, JD = 1000 -4685-5-19 12:0:0, JD = 10000 -4439-10-14 12:0:0, JD = 100000 -1975-11-7 12:0:0, JD = 1000000 22666-7-5 12:0:0, JD = 10000000 2000-4-25 19:14:0, JD = 2451673.3014
Required options
These options will be used automatically if you select this example.
Select the Julian date format.
Use a custom date pattern.
(Select custom mode first).
Print the continuous count of
days since the beginning
of the Julian period.
Set the precision of a Julian day.
Display full-width dates in
the Julian calendar. (All
components will be printed
with padding).
Display Julian dates with
a 12-hour clock time part.

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!

https://onlinetools.com/time/convert-gregorian-date-to-julian-date?input=2010-01-15&print-julian-day=false&julian-day-precision=4&format=YYYY-MM-DD&custom-format=YYYY.MM.DD&padding=true&use-12-hour-clock=false

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