Subtracting Hours in Query

rastus

Board Regular
Joined
Jul 8, 2005
Messages
157
Hi

I have a query with two calculated fields that return the business hours between two sets of dates in the format "h:nn".

What I would like to do is subtract the first field [HoursA] from the second [HoursB], but the expression [HoursA] - [HoursB] doesn't work like it would in excel. I have also tried DateDiff("n", [HoursA], [HoursB]), but this only works if either field is less than 24 hours.

Does anyone have a expression for subtracting these calculated fields e.g. 20:00 - 5:00 = 15:00 hours?

Regards
R
 

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Hi Steve, How are you? I did a test here that just as you quoted, calculated fields in the query subtracting one hour from another, on principle did not work, as if the values ​​were divided by one hundred, to solve I put the format of the fields in the query as "h: nn", you tried it?
 
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If your fields are true dates you should be able to add/subtract directly. Is the result of your query a true time in time format, or is it a text string that represents a time? When you say it doesn't work, what is the error or problem you are getting?
 
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