Convert date string to date time
When date information from other systems is pasted or imported to Excel, it may not be recognized as a proper date or time. Instead, Excel may interpret this information as a text or string value only.
To convert a date string to a datetime (date with time) you can parse the text into separate components then build a proper datetime.
In the example shown, we are using the formulas below.
To extract the date, the formula in C5 is:
To extract the date, the formula in d5 is:
To assemble a datetime, the formula in E5 is:
How these formulas work
To get the date, we extract the first 10 characters of the value with LEFT:
LEFT(B5,10) // returns "2015-03-01"
The result is text, so to get Excel to interpret as a date, we wrap LEFT in DATEVALUE, which converts the text into a proper Excel date value.
To get the time, we extract 8 characters from the middle of the value with MID:
MID(B5,12,8) // returns "12:28:45"
Again, the result is text. To get Excel to interpret as a time, we wrap MID in TIMEVALUE, which converts the text into a proper Excel time value.
To build the final datetime, we just add the date value to the time value.
All in one formula
Although this example extracts the date and time separately for clarity, you can combine formulas if you like. The following formula extracts the date and time, and adds them together in one step:
Note that DATEVALUE and TIMEVALUE aren't necessary in this case because the math operation (+) causes Excel to automatically coerce the text values to numbers.