Hi
I assume your data is in column A, just like your post shows.
I define the name Months as ={"January";"February";"March";"April";"May";"June";"July";"August";"September";"October";"November";"December"}
Columns B, C, D, E are (Year, Month, Day, Time) determined by the following formulas
The date-time can be achieved using
Now you can operate with real data-time as I do in column G, in G2 with =F3-F2 and leave G3 empty.
To drag down the formula you must select G2:G3.
See the file for clarification
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