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How to convert between Julian date and calendar date in Excel?

Generally, Julian date is a date format which includes 5 digit numbers, first two indicate the year, and last three indicate the day of the year. For example, 14001 indicates 1/1/2014 in calendar. Now this tutorial is talking about the methods on conversion between Julian date and calendar date in Excel.

Convert Julian date to calendar date

Convert calendar date to Julian date


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arrow blue right bubble Convert Julian date to calendar date


To convert Julian date to calendar date, you just need a formula in Excel.

1. In a blank cell, type this formula =DATE(IF(0+(LEFT(A1,2))<30,2000,1900)+LEFT(A1,2),1,RIGHT(A1,3)) into it, press Enter key, if you need, you can drag the fill handle to a range with this formula. See screenshot:
doc-convert-julian-date-1

Tip: A1 indicates the Julian date you need to convert to calendar date.

2. Then right click at these highlighted cells, and select Format Cells from context menu, and in the popped out Format Cells dialog, under Number tab, click Date in the Category list, then select the date type you need in the right section.
doc-convert-julian-date-2

3. Click OK, then you can see all Julian dates have been converted to calendar dates.
doc-convert-julian-date-3


arrow blue right bubble Convert calendar date to Julian date

If you want to convert calendar date to Julian date, you can use below formulas.

In a blank cell, type this formula =TEXT(A1,"yy")&TEXT((A1-DATEVALUE("1/1/"&TEXT(A1,"yy"))+1),"000") and press Enter key, if you need you can apply this formula to a range by dragging the auto fill handle.
doc-convert-julian-date-4
Tip: A1 is the calendar date you want to convert to Julian date.


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    Cliff Johnston · 10 months ago
    Hi, there is a problem when you try to convert Julian date to calendar date with dates of 2001 thru 2009. Any suggestions? Example 1/1/2001 = JD of 01001 which is correct. However if you use the formula JD of 01001 to Calendar Date conversion the answer is 1/1/2010. Where is this error?
  • To post as a guest, your comment is unpublished.
    Satish · 2 years ago
    Tried with formulae given in the post, but not working.
    Output is as something like 2017Tue
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      Sunny · 2 years ago
      Sorry I cannot get your problem clearlly? Could you upload a screenshop of your file to me for sovling? Thank u.
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    Jonathan · 2 years ago
    Hey Mister, I am getting incorrect values when the year is a leap year. Thanks though, I am grateful for this.
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    John Murrell · 3 years ago
    Total rubbish the definition of Julian date is:
    The Julian Day Number (JDN) is the integer assigned to a whole solar day in the Julian day count starting from noon Universal time, with Julian day number 0 assigned to the day starting at noon on January 1, 4713 BC, proleptic Julian calendar (November 24, 4714 BC, in the proleptic Gregorian calendar),[1][2][3] a date at which three multi-year cycles started (which are: Indiction, Solar, and Lunar cycles) and which preceded any historical dates.[4] For example, the Julian day number for the day starting at 12:00 UT on January 1, 2000, was 2,451,545.[5]

    A modified version of the Julian date denoted MJD obtained by subtracting 2,400,000.5 days from the Julian date JD, The MJD therefore gives the number of days since midnight on November 17, 1858.

    There are inherent problems with conversion into Excel due to the fact that has a leap year error (in 1900??) also astronomers who use JD have a year zero which does not exist in the normal civil calendar which goes from 1BC to 1AD with no year zero. Historically correct but bad for calculations
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      Steve · 2 years ago
      The military writes the Julian day out like this. The first 2 digits are the last 2 digits of the current year and the next 3 digits are the day corresponding to the 365/366 calendar day.
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      joe · 2 years ago
      This is very thorough helpful information. Thanks for posting.