Convert Dates to Week Ranges in Google Sheets (Array Formula)

GiGiKing·March 15, 2024·0 comments

Are you tired of manually converting dates in Google Sheets into week ranges? Fret not! In this article, I will share with you an array formula that will do the job for you, saving you time and effort. Plus, I’ll show you how to address a common issue that arises when combining week ranges for sorting. So, let’s dive in!

Converting Dates to Week Ranges: Separate Start and End Dates

To convert dates in a column into week ranges with separate start and end dates, follow these steps:

  1. Copy the following array formula and paste it into an available blank cell:

    =LET(range, A2:A, n, (MAX(range)-MIN(range))/7, IFNA(HSTACK(SEQUENCE(n+1, 1, MIN(range), 7), IFERROR(SEQUENCE(n, 1, MIN(range)+6, 7), MAX(range)))), MAX(range))

    Make sure to select the result and apply Format > Number > Date.

  2. The formula will return the week start dates in one column and the end dates in another column. Ensure that there are enough blank cells to accommodate the formula’s expansion; otherwise, a #REF error will occur.

That’s it! You have successfully converted dates into week ranges with separate start and end dates. But wait, there’s more!

Assigning Week Ranges to Corresponding Dates

To associate the converted week ranges with their corresponding dates, follow these additional steps:

  1. Assuming the dates are in column A (A2:A) and the expenses are in column B (B2:B), use the following formula in cell C2 to assign the start dates in column E (E2:E) corresponding to the dates in column A:

    =ArrayFormula(XLOOKUP(A2:A, E2:E, E2:E,,-1))

  2. For the end dates in column F (F2:F), insert the following formula in cell D2:

    =ArrayFormula(XLOOKUP(A2:A, E2:E, F2:F,,-1))

  3. Select cells C2:D and apply Format > Number > Date.

Voila! You have now linked the converted week ranges to their corresponding dates.

Anatomy of the Formulas

Now, let’s take a closer look at how the formulas work.

How the Formula Converts Dates to Week Ranges

The formula for converting dates to week ranges utilizes the LET function to declare variables for later use. Here’s a breakdown of the formula’s components:

  • range, A2:A assigns the variable ‘range’ to the dates in column A.
  • n, (MAX(range)-MIN(range))/7 calculates ‘n,’ representing the number of rows needed for the week start and end dates.
  • The formula expression uses the IFNA and HSTACK functions to generate the week start and end dates in the respective columns. It ensures that there is an equal number of rows in both columns by handling any potential errors.

The Role of XLOOKUP in Assigning Dates

To assign the converted week ranges to their corresponding dates, we use the XLOOKUP function. The first XLOOKUP formula searches the dates (A2:A) in the start date column (E2:E) and returns the start dates (E2:E). The second XLOOKUP formula does the same for the end dates (F2:F). If there is no exact match, the formulas return the value from the start date column that is less than the search key, ensuring that the dates fall within the converted week range.

Converting Dates to Week Ranges: Combined Start and End Dates

If you prefer to have a true week range that combines both the start and end dates, follow these steps:

  1. Copy the following array formula and paste it into an available blank cell:

    =ArrayFormula(LET(range, A2:A, n, (MAX(range)-MIN(range))/7, weeks, IFNA(HSTACK(SEQUENCE(n+1, 1, MIN(range), 7), IFERROR(SEQUENCE(n, 1, MIN(range)+6, 7), MAX(range)))), formatted, HSTACK(TEXT(SEQUENCE(ROWS(weeks)), "00."), TEXT(CHOOSECOLS(weeks, 1), "DD/MM/YYYY"), IF(CHOOSECOLS(weeks, 1), "-",), TEXT(CHOOSECOLS(weeks, 2), "DD/MM/YYYY")), TRANSPOSE(QUERY(TRANSPOSE(formatted),, 9^9))))

    Remember to replace DD/MM/YYYY with your desired date formatting.

  2. The formula will generate a combined week range in one column. Simply transpose the result to fit your desired layout.

And there you have it! You can now effortlessly convert dates into combined week ranges.

Formula Breakdown

Let’s break down the formula that generates combined week ranges:

  • range, A2:A assigns the variable ‘range’ to the dates in column A.
  • n, (MAX(range)-MIN(range))/7 calculates ‘n,’ representing the number of rows required for week start and end date population.
  • The ‘weeks’ variable represents the converted week ranges in two columns.
  • The ‘formatted’ variable combines the sequence numbers, start dates, hyphens, and end dates using the HSTACK and TEXT functions.
  • The formula expression utilizes the TRANSPOSE and QUERY functions to concatenate the columns, resulting in the combined week range.

Resources

If you’re hungry for more Google Sheets tips and tricks, check out these additional resources:

  1. Summarize Data by Week Start and End Dates in Google Sheets
  2. Calendar Week Formula in Google Sheets to Combine Week Start and End Dates
  3. Consecutive Dates to Date Ranges in Google Sheets: The REDUCE Method
  4. How to Group by Week in Pivot Table in Google Sheets

Now that you’re armed with this array formula, you can easily convert dates to week ranges in Google Sheets. Say goodbye to manual calculations and hello to increased efficiency in your data analysis. Happy Sheets-ing!

GiGiKing

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