Calculate the duration between 4 different times in different countries with a formula in an excel report

This formula allows me to calculate the duration between 2 time schedules and 2 time frames based in different countries by taking in account the time zone, it is useful for instance if I want to know how long an outage has impacted a shop.

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When I use the formula ?

To calculate the impact duration of an issue per country.


How to use the formula ?

The formula in this topic is with "," so depending of the operating system of your PC, the formula should have ";" instead of ",".


How are the formula ?



Before to reach the result shows in the picture above, normally, I start with few data, something like that:

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Since I am located in Spain, the outage time is in CET time zone. The first things I will do, it is to fill up the cells:

  • Column D: I use a tool found in internet to check the difference between my country and the rest
  • In cell A3: =$A$2+D3/24 then copy to below cells
  • In cell B3: =$B$2+D3/24 then copy to below cells
  • Column E and F: no matter which country, the open/close times should be in the local time, to make easier, I put that all shops have the same time schedule. This is because the outage time will be converted to the local time with the formula A3 and B3
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As we can see, B5 doesn’t show the time correctly, this is because with the data I have, excel considers that all time (except 1) have the same date so it doesn’t take in account the after day of the outage.

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First, I will add a date column showing the date of the outage then:

  • In cell A3: =INT(B3) then copy to below cells -> format the cell in "short date"
  • In cell B3: =$A$2+($B$2+E3/24) then copy to below cells
  • In cell C3: =$A$2+($C$2+E3/24) then copy to below cells
  • In cell F3: =A3+15/24 -> 15 is the open time
  • In cell G3: =F3+10/24 -> 10 is how many hours the shop is open
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It is better but still values in column C are not correct. This is because I simply convert the time without taking in account the duration of the outage. This is the formula for the outage duration:


If I put this formula in any cell, for instance in cell J1, the result will be 6 so let´s incorporate it in the formula of my cell C3, this is the new formula:


With this last modification, the results are correct and here the formula:


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