Hi @DHall-1 ,
I've made a test for your reference:
1\I assume there is a SharePoint list

2\Formula
With(
{
Start:Date(2024,2,19),
End:Date(2024,2,23)
},
ForAll(
Sequence(DateDiff(Start,End,TimeUnit.Days)+1,0,1),
Patch(
BofTest0223,
Defaults(BofTest0223),
{LeaveDate:DateAdd(Start,Value,TimeUnit.Days)}
)
)
)
3\Result

Best Regards,
Bof