Custom filtering on month value only of an entire date field

I’ve solved it by creating a Custom Meta Field filter using the following options:

-01-::Jan|-02::Feb|-03-::Mar|-04-::Apr|-05-::May|-06-::Jun|-07-::Jul|-08-::Aug|-09-::Sep|-10-::Oct|-11-::Nov|-12-::Dec

The “-mm-” in each part matches the month stored in the database. Pretty simple really but this works perfectly.

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