Here’s an AMPscript snippet to determine if a date falls in the Daylight Savings period as defined by NIST.gov:
Output:
dateToCheck: 2023-10-25
month: 10
day: 25
dayOfWeekToFind: Wed
dayOfWeekNum: 4
prevSunday:
isDST: 1
Try it yourself with multiple dates: https://mcsnippets.herokuapp.com/s/6tGSENDB
NOTE: this doesn’t handle times, but could be expanded to do so.
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