Sorting by Date column
This discussion was created from comments split from: Date format.
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Zotero is quite liberal in allowing data entry -- e.g. December 13, 2019, 2019-12-13, 13.12.2019 and 12/13/2019 are all recognized as today's date*. The last two, though, are tricky when the month/day order is ambiguous. Zotero decides whether to interpret 12/11/2019 as November 12 or December 11 based on your locale. You can see what it does based on the order of the letter mdy next to the year.
If you want to be certain a date is parsed correctly, used one of the two first options, i.e. spell out the month or use ISO (YYYY-MM-DD) format.
*as is the literal word "today"
Best