Excel merge cell date and time
There is a very simple formula that can quickly help you combine date column and time column into one.
Type this formula = TEXT(A2,"m/dd/yy ")&TEXT(B2,"hh:mm:ss")
A2 indicates the first data in date column,
B2 stands the first data in time column,
you can change them as you need) into a blank cell,
and press Enter key,
then drag the fill handle to fill the range you want to use this formula.
See screenshot:
More :https://www.extendoffice.com/documents/excel/1538-excel-combine-date-and-time.html
ADD the two values
Dates and Times are stored in Excel as numbers of days since 1 Jan 1900 and fractions of a day for the time. So to combine a date and time you would add them
Format the result as
yyyy-mm-dd hh:mm:ss
You can achieve this by using TEXT function.
As long as the date is on the A1 cell..
=TEXT(A1,"YYYY-MM-DD")
=TEXT(A1,"HH:MM:SS")