A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
As you probably know, in Excel date and time are stored internally as a number... whole part denotes number of days from 1 Jan 1900 and fractional part denotes the time... 1 equal to 24 hours so... one hour is stored as 1/24...
Try to format you cell as numbers and see if there is a fractional part. Separate that into the next cell and format as time.
Not sure how it is showing up as 12/31/1899.