I've got some data from Taiwan in a .csv spreadsheet, but the dates are all in their patriotic calendar like this:


I need them in Gregorian format like this:


The conversion is simple, just add 1911 to the year. Any ideas of a simple way to it in Excel?

  • Seems like this belongs on SuperUser, unless you want to do this in a program as opposed to using normal Excel.
    – Joe
    Jun 22, 2013 at 4:10

2 Answers 2


If the existing Year, i.e. 102, is alway 3 digits then with data in A1 convert it to required date with this formula in B1


format result in required date format, e.g. yyyy/mm/dd


To skip the problems Excel have when calculating dates before 01/01/1900 you can try to do something, if you think at your data as a string.

So if your data apears in your formula bar like this 102/06/05 you can simply try a CTRL+F, switch to replace, type to find 102/ string and replace with 2013/.

If this doesn't work you can edit the csv file with a text editor, and perform this replace, before you load the file in Excel.

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