“Spring forward” or “fall back” letters

This crossword clue is for the definition: “Spring forward” or “fall back” letters.
it’s A 39 letters crossword puzzle definition.
Next time, when searching for online help with your puzzle, try using the search term ““Spring forward” or “fall back” letters crossword” or ““Spring forward” or “fall back” letters crossword clue”. The possible answerss for “Spring forward” or “fall back” letters are listed below.

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Possible Answers: DST.

Last seen on: NY Times Crossword 11 Jan 23, Wednesday