I'm trying to retrieve just the month from a value I have saved as a DateTime data type.
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You can use the following as per your requirement:-
text(ri!date,"m") /*Return month in numeric format that can be either one or two digit. (Eg. "7")*/
text(ri!date,"mm") /*Return month in numeric format that would two digit. (Eg. "07")*/
text(ri!date,"mmm") /*Return month in text format that can would be 3 letter text. (Eg." Jan")*/
text(ri!date,"mmmm") /*Return month in text format that can would be name of month. (Eg. "January")*/