I missed that the Tips&Tricks section of the community site has an example that I could have pointed you toward - Issues created out of office hours. See the last part of the first post.
But the calculated measure formula for the period 7:30-11:30 could look similar to the one below:
Sum(
Filter(
Descendants([Issue].CurrentHierarchyMember,[Issue].[Issue]),
(
Hour(DateParse([Issue].CurrentHierarchyMember.get('Created at'))) > 7
OR
Hour(DateParse([Issue].CurrentHierarchyMember.get('Created at'))) = 7
AND
Minute(DateParse([Issue].CurrentHierarchyMember.get('Created at'))) >= 30
)
AND
(
Hour(DateParse([Issue].CurrentHierarchyMember.get('Created at'))) < 11
OR
Hour(DateParse([Issue].CurrentHierarchyMember.get('Created at'))) = 11
AND
Minute(DateParse([Issue].CurrentHierarchyMember.get('Created at'))) <= 30
)
),[Measures].[Issues created]
)
Best,
Roberts // support@eazybi.com