Elapsed Days as Years, Months and Days

If you are using Excel to track information about projects, you may want to know the duration of a given project in years, months, and days. If you have the starting date and the ending date for each project, you can use the DATEDIF worksheet function to return the information in the desired manner.

For instance, let's assume that you have a starting date in cell E7 and the ending date in cell F7. You can calculate the difference between the two dates with this very simple use of DATEDIF:

=DATEDIF(E7,F7,"d")

This function returns the number of days between the two dates, provided the date in E7 is less than or equal to the date in F7. The third argument, "d", causes DATEDIF to return its result in days. You can also specify months ("m") and years ('y"). For the purposes of this example, however, there are several other arguments that are particularly helpful: months excluding years ("ym"), days excluding years ("yd"), and days excluding months and years ("md").

Using these different arguments, you can concoct a formula that will return an answer indicating the elapsed days as years, months and days. (Because of the length of the formulas in this tip, I've broken them into separate lines to make them a bit easier to read. This is a single formula, however, and should be entered as such into Excel.)

=DATEDIF(E7,F7,"y") & " years, " & DATEDIF(E7,F7,"ym")
& " months, " & DATEDIF(E7,F7,"md") & " days "

Note that this formula will always return plural units, as in years, months, and days. For those who want to be grammatically correct and provide singular units when it is called for, the following formula will do the trick:

=IF(DATEDIF(E7,F7,"y")=1,DATEDIF(E7,F7,"y")&" year, ",
DATEDIF(E7,F7,"y")&" years, ")&IF(DATEDIF(E7,F7,"ym")=1,
DATEDIF(E7,F7,"ym") &" month, ",DATEDIF(E7,F7,"ym")
&" months, ")&IF(DATEDIF(E7,F7,"md")=1,DATEDIF(E7,F7,"md")
&" day",DATEDIF(E7,F7,"md")&" days")

This works in all instances except when either years, months, or days is zero. To get rid of the proper unit when it is zero requires an even longer formula:

=IF(DATEDIF(E7,F7,"y")=0,"",IF(DATEDIF(E7,F7,"y")=1,
DATEDIF(E7,F7,"y")&" year, ",DATEDIF(E7,F7,"y")&" years, "))
&IF(DATEDIF(E7,F7,"ym")=0,"",IF(DATEDIF(E7,F7,"ym")=1,
DATEDIF(E7,F7,"ym")&" month, ",DATEDIF(E7,F7,"ym")&" months, "))
&IF(DATEDIF(E7,F7,"md")=0,"",IF(DATEDIF(E7,F7,"md")=0,
DATEDIF(E7,F7,"md")&" day ",DATEDIF(E7,F7,"md")&" days"))

This formula is getting quite long, but it will return only those units for which there is a value. Thus, instead of returning "0 years, 2 months, 1 day", it will return "2 months, 1 day."

Even this is not a perfect formula, as it will still display the commas between entries in some situations where they are not warranted. The following megaformula should fix plurals and commas and get rid of zero entries.

=IF(DATEDIF(E7,F7,"y")=0,"",IF(DATEDIF(E7,F7,"y")=1,
DATEDIF(E7,F7,"y")&"year",DATEDIF(E7,F7,"y")&"years"))
&IF(AND(DATEDIF(E7,F7,"y")<>0,DATEDIF(E7,F7,"ym")<>0),", ","")
&IF(DATEDIF(E7,F7,"ym")=0,"",IF(DATEDIF(E7,F7,"ym")=1,
DATEDIF(E7,F7,"ym")&" month",DATEDIF(E7,F7,"ym")&" months"))
&IF(AND(OR(DATEDIF(E7,F7,"y")<>0,DATEDIF(E7,F7,"ym")<>0),
DATEDIF(E7,F7,"md")<>0),", ","")&IF(DATEDIF(E7,F7,"md")=0,"",
IF(DATEDIF(E7,F7,"md")=1,DATEDIF(E7,F7,"md")&" day",
DATEDIF(E7,F7,"md")&" days"))