I understand Time Machine combines the hourly data blocks to provide a daily 
(24 hour) summary with further amalgamation after a month to create weekly 
backups.

How is the “day” defined?  Is it local time 0001-2400 hours or some magic Apple 
time?

I’ve been looking closely at the daily summary for 25 April.  I have a 
suspicion some data for early on the 26th is included.

Cheers
Alan
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