[n4r9]

Works okay until someone opens the file in Excel, writes "2-9" into a cell, and saves it without realising it's been changed to "02/09/2025" behind the scenes.

[chungy]

Wait until you find out that "02/09/2025" is actually 45697 behind the scenes ;)

[cluckindan]

And thus, with some semantic leeway, -7 = 45697

[porridgeraisin]

Why?