Hi @Anonymous ,
Do you want to display weekday of the corresponding date time value within your Gallery?
Based on the needs that you mentioned, I agree with @sayyed007amir 's thought almost. The Weekday() function could achieve your needs.
Please consider add a Label inside your Gallery, set the Text property of this Label to following:
Switch(
Weekday(ThisItem.Start),
1, "SUN",
2, "MON",
3, "TUE",
4, "WED",
5, "THU",
6, "FRI",
7, "SAT"
)
Note: The Start represents the Start Date time type column in your SP List, please replace it with actual column name
Weekday function
Please take a try with above solution, check if the issue is solved.
Best regards,