wrote in message
ps.com
How are the fares calculated when you entry is before 7am and exit
after 7am or entry before 7pm and exit after 7pm?

Is it that if any entry/exit time is in the 7am-7pm window then you
get charged the higher price or is it the entry (exit) time that is
considered?

For example, I'm (probably) going to do Watford (met) to Moorgate
tomorrow - journeyplanner.tfl.gov.uk says 06:03 to 06:57 with a change
at Moor Park. If this doesn't get in until 07:01 then what will the
charge be?

The Oyster charge depends on when you enter the station. As long as you
exit within two hours, the exit time doesn't make any difference.