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Time calculations over 24hrs
Hi
I'm using Excel 2003. I'm trying to calculate the total hours (C1) by subtracting end time (B1) from start time (A1) I have formatted the cells for time. I'm currently using B1-A1 which works OK until the end time goes past midnight. e.g start 19:50 end 00:20 should = 4:30 except i just get an endless series of ####### Thanks for your time. Ian |
#2
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Time calculations over 24hrs
On Thu, 6 May 2010 11:32:35 +0100, Ian R wrote:
Hi I'm using Excel 2003. I'm trying to calculate the total hours (C1) by subtracting end time (B1) from start time (A1) I have formatted the cells for time. I'm currently using B1-A1 which works OK until the end time goes past midnight. e.g start 19:50 end 00:20 should = 4:30 except i just get an endless series of ####### Thanks for your time. Ian For up to 24 hrs: =B1-A1+(B1=A1) Format result as h:mm For more than 24 hours, you will have to include the date also, and format the result as [h]:mm --ron |
#3
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Time calculations over 24hrs
Hi Ian,
That's because Excel sees 00:20 (without a date) as being less than 19:50, and Excel doesn't recognise the viability of time-travel. i.e. you can't have a negative expression of time. Actually, I'm a little confused by your question; you state that you are subtracting B1 from A1, but show your formula as B1-A1, which is the other way around. For this I will assume you have start time in A1 and end time in B1, so your formula would have been correct rather than your description. To get around your problem you have to let Excel know that 00:20 is actually the next day, which you can do by adding 1 to it when B1 is less than A1. This will achieve that: =B1+(B1A1)-A1 HTH Steve D. "Ian R" wrote in message m... Hi I'm using Excel 2003. I'm trying to calculate the total hours (C1) by subtracting end time (B1) from start time (A1) I have formatted the cells for time. I'm currently using B1-A1 which works OK until the end time goes past midnight. e.g start 19:50 end 00:20 should = 4:30 except i just get an endless series of ####### Thanks for your time. Ian |
#4
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Time calculations over 24hrs
Comparing Ron's answer to mine raises another question, how do you want
Excel to deal with A1=B1? "Steve Dunn" wrote in message ... Hi Ian, That's because Excel sees 00:20 (without a date) as being less than 19:50, and Excel doesn't recognise the viability of time-travel. i.e. you can't have a negative expression of time. Actually, I'm a little confused by your question; you state that you are subtracting B1 from A1, but show your formula as B1-A1, which is the other way around. For this I will assume you have start time in A1 and end time in B1, so your formula would have been correct rather than your description. To get around your problem you have to let Excel know that 00:20 is actually the next day, which you can do by adding 1 to it when B1 is less than A1. This will achieve that: =B1+(B1A1)-A1 HTH Steve D. "Ian R" wrote in message m... Hi I'm using Excel 2003. I'm trying to calculate the total hours (C1) by subtracting end time (B1) from start time (A1) I have formatted the cells for time. I'm currently using B1-A1 which works OK until the end time goes past midnight. e.g start 19:50 end 00:20 should = 4:30 except i just get an endless series of ####### Thanks for your time. Ian |
#5
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Time calculations over 24hrs
Use
=MOD(B1-A1,1) -- HTH Bob "Ian R" wrote in message m... Hi I'm using Excel 2003. I'm trying to calculate the total hours (C1) by subtracting end time (B1) from start time (A1) I have formatted the cells for time. I'm currently using B1-A1 which works OK until the end time goes past midnight. e.g start 19:50 end 00:20 should = 4:30 except i just get an endless series of ####### Thanks for your time. Ian |
#6
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Time calculations over 24hrs
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