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I have a sheet with 2500 dates & times of when customers have placed their order.

I want to do a heatmap or a bar graph to show which days of the week are the busiest. I rounded the exact times using mround to round up or down to the nearest whole hour.

But when I pivot on the data, for example, The 'Sunday 10:00 AM' at the beginning of the column I guess is not the same as the 'Sunday 10:00 AM' for the following week, and so on.

I tried converting the date to_text. Which worked, but then the pivot table couldn't be sorted in chronological order.

  • can you share a copy of your sheet? – user0 May 22 at 13:44
  • Here's a link to the copy of the sheet docs.google.com/spreadsheets/d/… – Matt Winer May 22 at 14:07
  • you want that heatmap/chart to represent one week interval to see the "heat" per weekdays, right? – user0 May 22 at 14:21
  • also, is Sunday for you the 1st day of the week or 7th? – user0 May 22 at 14:35
  • yeah so basically I want the total number of transactions for all the Sunday 10:00 AM summed up into one entry. Which, if I filter the column it works correctly (looks like there are 80 entries for this time). But the pivot table does not work. – Matt Winer May 22 at 14:35
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instead of your formula in B column and the whole pivot table, use:

=ARRAY_CONSTRAIN(ARRAYFORMULA(REGEXREPLACE(QUERY(IF(LEN(A2:A), 
 {WEEKDAY(A2:A), TEXT(A2:A, "dddd am/pm hh:00 am/pm")}, ), 
 "select Col2,count(Col2),Col1 
  where Col2 is not null 
  group by Col2,Col1 
  order by Col1
  label count(Col2)''", 0)&"AM ", "PM |AM ", "")), 999^99, 2)

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  • That works great. and I don't mean to get picky. Is there a way to then sort it so the dates are chronological? – Matt Winer May 22 at 14:56
  • you mean AM/PM to be in chrono order? – user0 May 22 at 14:58
  • yeah so when I graph it, everything is in order. Sunday 10am, 11am, 12pm,... Monday 8am, 9pm, etc – Matt Winer May 22 at 15:25
  • yeah that would work. for sure – Matt Winer May 22 at 16:16
  • @MattWiner answer updated – user0 May 22 at 16:36

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