The DATEDIF function is useful in formulas where you need to calculate an age. By default, Januis serial number 1, and Januis serial number 39448 because it is 39,447 days after January 1, 1900. ![]() DATEDIF ('' '' 'md') Here the function calculates the difference between the two dates in days but ignoring years and months. Dates are stored as sequential serial numbers so they can be used in calculations. With this number format code you can represent any number as a time difference. Here the function calculates the difference between the two dates in whole months but ignoring years, showing that it is 1 month since Philippes 38th birthday. An easy example would be to use :MM:SS (am/pm makes no sense for time differences) which tells the number formatter that you don't want to calcuate times modulo 24 hours. In your case you want to show negative time (or time differences) so you want to represent negative numbers like -0.1 as -02:24:00 which requires you to adapt the number format code. DATEDIF ('' '' 'md') Here the function calculates the difference between the two dates in days but ignoring years and months. The number format code that corresponds to 12:00:00 AM is HH:MM::SS AM/PM which says that the time should be calculated modulo 24 hours and AM/PM applied automatically. Here the function calculates the difference between the two dates in whole months but ignoring years, showing that it is 1 month since Philippe's 38th birthday. > How can I achieve this He probably meant B1-A1. I'm using this spreadsheet for office > productivity. In column C I would > like to calculate the difference of column B and column A in > minutes or hours. I enter data > into these columns in the format hh:mm. Use the MONTH function to obtain the month value for each date, and then calculate the difference between the values. Column A contains the > start time and column B contains the end time. ![]() Excel treats months as values (1 through 12), which makes it easy to subtract an earlier date from another date as long as both dates fall in the same year. The second important thing to understand is that the number format code tells you how your value is interpreted. You can use the following operators in Calc: arithmetic, comparative, text, and reference. Calculate the number of months between two dates in the same year. Now if you add the default time format you'll get something like 12:00:00 AM (for an en-US locale, for other locates the representation looks different). The value 1 represents 24 hours when formatted as time or one day past the zero date (can be changed in the options). It doesn't use helper columns - I have hard-coded the shift patterns instead. I ended up with this, working off the sheet in post #32. As with JeteMc it seemed like there should be a neater solution but it turned out the code got a lot longer to deal with the weekend bit.
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