Solution to Error: Do you know a formula that will subtract a number of hours and minutes from 10am to get a start time?

Do you know a formula that will subtract a number of hours and minutes from 10am to get a start time?

Do you know a formula that will subtract a number of hours and minutes from 10am to get a start time?

Keys to the Problem Do you know a formula that will subtract a number of hours and minutes from 10am to get a start time?

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CicokidWR wrote:
Do you know a formula that will subtract a number of hours and minutes from 10am to get a start time?

If A1 contains the start time and A2 contains the hours and minutes in the form hh:mm, then:

=A1-A2+(A2>A1)

formatted as Custom hh:mm.

The "A2>A1" component allows for crossing midnight -- for example, subtracting more than 10 hours from 10am.  It assumes that we are subtracting no more than 24 hours, in general.

EDIT....  You can also write:

=A1-"01:30"

and

=A1-TIME(1,30,0)

to subtract 1hr 30min.  But it is harder to deal with crossing midnight -- subtracting more time than the start time of the day.

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1. Click on the Start button on the Taskbar.
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3. Click on Windows Memory Diagnostic Tool (in the search results).
4. Click on "Restart now and check for problems (Recommended)".
5. The system will restart, and you need to follow the instructions given on the screen.

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