Reclaim uses the time and date format settings associated with your main account's email address.
Available date formats
mm/dd
dd/mm
Available time formats
12-hour clock
24-hour clock
Manage your date and time format configuration by navigating to Google Calendar > Settings > Language and region.
You may need to change the language from English (UK) to English (US) if you would like the date format to be MM/DD/YY.