FormatCells>Custom: Into Type field enter the format.


You can also use formats like "[h]:mm:ss" or "[s]", but not "[d]" or "[d] hh:mm:ss".


The feature is available at least from year 2000, when I started to use MS Office instead of Quattro Pro and Visual FoxPro. But I'm not sure about web-based Office! I have MS Office installed in my computer.