Since all Excel functions that change text to date return a number as a result, let's have a closer look at converting numbers to dates first.
As you probably know, Excel stores dates and times as serial numbers and it is only a cell's formatting that forces a number to be displayed as a date. For example, 1-Jan-1900 is stored as number 1, 2-Jan-1900 is stored as 2, and 1-Jan-2015 is stored as 42005. For more information on how Excel stores dates and times, please see Excel date format.
When calculating dates in Excel, the result returned by different date functions is often a serial number representing a date. To convert such serial number to date in Excel, all you have to do is change the cell formatting. For this, select a cell or a range of cells with the numbers you want to convert to dates and press Ctrl+1 to open the Format Cells dialog. On the Number tab, choose Date, select the desired date format under Type and click OK.
That's right, it's that simple! In the event that you need something more refined than predefined Excel date groups, if it's not too much trouble perceive how to make a custom date arrange in Excel.
On the off chance that some unshakable number declines to change to a date, look at Excel date organize not working - investigating tips.