Weekly Challenges
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Well, I got to go down a fun RegEx Rabbit Hole for this one. To be fair I never actually converted into DateTime format, but then again the challenge said we were working with an integer that was a word, so I worked with a word.
I used RegEx to define all 7 characters of the string in 4 groups - the decade ID/year/mm/dd, then replace the decade ID $1 with 19 or 20, and then format the rest at the same time with dashes to just do it all in one tool. Formula runs .3ms (6.8% of the total runtime)
Enjoy
