See also https://github.com/alekrutkowski/ExcelLambdaTools
Convert 1-column range monthly dates in the format yyyy-mm, e.g. 2023-11, to 2-column range:
- 1st column: year number if it's January, otherwise empty
- 2nd column: the 3-character month code, e.g. "Nov"
=LAMBDA(rng,
LET(