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When I use Google Sheets, I can format numbers Format -> Number -> More Formats -> Custom number format .... There are specific placeholders described in the help.

What's not mentioned, however, is the following behaviour:

When I set the custom format to d, 18 appears. If I write ed, another number appears. Using quotation marks leads to the correct value.

Why do some letters represent numbers? What's the logic behind it? I had the clue that it could be a date format, but d-m-y does not lead to the correct date.

  • We probably need to see more output to offer any suggestions. What's your source number? What's the format you're using? – ale Aug 7 '18 at 14:31
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Actually, you nailed it. those letters do represent date values however date needs to be in the specific overall format:

  • d needs to be in a pair like dd or ddd
  • same goes for m > mm or mmm (single m stands for minutes)
  • and the year is usually yyyy

eg valid format would be "MM/DD/YYYY" or dd.mm.yyyy etc.

check this for more knowledge: https://developers.google.com/sheets/api/guides/formats

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