Skip to content
Free Excel Tutorials
  • Home
  • Excel For Beginners
  • Excel Intermediate
  • Advanced Excel For Experts

Data Analysis

  • Understanding Anova in Excel
  • Conflicting Multiple Conditional Formatting Rules in Excel
  • Reverse List in Excel
  • Randomize/ Shuffle List in Excel
  • Data Series in Excel

References

  • How to get address of first cell in range in Excel
  • How to get relative column numbers in a range in Excel
  • How to get last row in mixed data with blanks in Excel
  • Approximate match with multiple criteria in Excel
  • How to use Excel LOOKUP Function

Data Validations

  • Excel Data validation don’t exceed total
  • Excel Data validation date in specific year
  • Excel Data validation date in next 30 days
  • Excel Data validation no punctuation
  • Data validation must not exist in list

Convert date to Julian format in Excel

by

This tutorial shows how to Convert date to Julian format in Excel using example below.

If you need to convert a date to a Julian date format in Excel, you can do so by building a formula that uses the TEXT, YEAR, and DATE functions.

Formula

=YEAR(date)&TEXT(date-DATE(YEAR(date),1,0),"000")

How-to-Convert-date-to-Julian-format-in-Excel-excel-tutorials-xlsoffice

Explanation

Background

“Julian date format” refers to a format where the year value of a date is combined with the “ordinal day for that year” (i.e. 14th day, 100th day, etc.) to form a date stamp.

There are several variations. A date in this format may include a 4-digit year (yyyy) or a two-digit year (yy) and the day number may or may not be padded with zeros to always use 3 digits. For example, for the date January 21, 2017, you might see:

1721 // YYD
201721 //YYYYD
2017021 // YYYYDDD

Solution

For a two-digit year + a day number without padding use:

=TEXT(B5,"yy")&B5-DATE(YEAR(B5),1,0)

For a two-digit year + a day number padded with zeros to 3 places:

=TEXT(B5,"yy")&TEXT(B5-DATE(YEAR(B5),1,0),"000")

For a four-digit year + a day number padded with zeros to 3 places:

=YEAR(B5)&TEXT(B5-DATE(YEAR(B5),1,0),"000")

How this formula works

This formula builds the final result in 2 parts, joined by concatenation with the ampersand (&) operator.

On the left of the ampersand, we generate the year value. To extract a 2-digit year, we can use the TEXT function, which can apply a number format inside a formula:

TEXT(B5,"yy")

To extract a full year, use the YEAR function:

YEAR(B5)

On the right side of the ampersand we need to figure out the day of year. We do this by subtracting the last day of the previous year from the date we are working with. Because dates are just serial numbers, this will give us the “nth” day of year.

To get the last day of year of the previous year, we use the DATE function. When you give DATE a year and month value, and a zero for day, you get the last day of the previous month. So:

B5-DATE(YEAR(B5),1,0)

gives us the last day of the previous year, which is December 31, 2015 in the example.

Now we need to pad the day value with zeros. Again, we can use the TEXT function:

TEXT(B5-DATE(YEAR(B5),1,0),"000")

Reverse Julian date

If you need to convert a Julian date back to a regular date, you can use a formula that parses Julian date and runs it through the date function with a month of 1 and day equal to the “nth” day. For example, this would create a date from a yyyyddd Julian date like 1999143.

=DATE(LEFT(A1,4),1,RIGHT(A1,3)) // for yyyyddd

If you just have a day number (e.g. 100, 153, etc.), you can hard-code the year and insert the day this:

=DATE(2016,1,A1)

Where A1 contains the day number. This works because the DATE function knows how to adjust for values that are out of range.

Post navigation

Previous Post:

DECIMAL function: Description, Usage, Syntax, Examples and Explanation

Next Post:

AVERAGE function: Description, Usage, Syntax, Examples and Explanation

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Learn Basic Excel

Ribbon
Workbook
Worksheets
Format Cells
Find & Select
Sort & Filter
Templates
Print
Share
Protect
Keyboard Shortcuts

Categories

  • Charts
  • Data Analysis
  • Data Validation
  • Excel Functions
    • Cube Functions
    • Database Functions
    • Date and Time Functions
    • Engineering Functions
    • Financial Functions
    • Information Functions
    • Logical Functions
    • Lookup and Reference Functions
    • Math and Trig Functions
    • Statistical Functions
    • Text Functions
    • Web Functions
  • Excel VBA
  • Excel Video Tutorials
  • Formatting
  • Grouping
  • Others

Logical Functions

  • How to use IFS function in Excel
  • AND function: Description, Usage, Syntax, Examples and Explanation
  • IFS function: Description, Usage, Syntax, Examples and Explanation
  • NOT function: Description, Usage, Syntax, Examples and Explanation
  • Nested IF function example in Excel

Date Time

  • Convert Excel time to Unix time in Excel
  • How to calculate Day of the Year in Excel
  • Check If Two Dates are same month in Excel
  • MONTH function: Description, Usage, Syntax, Examples and Explanation
  • Pad week numbers with zeros in Excel

Grouping

  • Group arbitrary text values in Excel
  • How to randomly assign people to groups in Excel
  • How to randomly assign data to groups in Excel
  • Group numbers at uneven intervals in Excel
  • Map inputs to arbitrary values in Excel

General

  • Basic text sort formula in Excel
  • How to count total columns in range in Excel
  • 44 Practical Excel IF function Examples
  • Basic numeric sort formula in Excel
  • How to count total number of cells in a rectangular range in Excel
© 2025 xlsoffice . All Right Reserved. | Teal Smiles | Abbreviations And Their Meaning