Microsoft Excel supports formatting timestamps in a workbook as a date followed by a time with an AM or PM value, i.e., the times are in 12-hour clock format where noon is 12:00 PM and midnight is 12:00 AM. You can select that format for a cell or column in a worksheet by highlighting the cell(s) or column (a column can be selected by clicking on the letter at the top of the column) and then clicking on Format then Cells and then clicking on Date and selecting a type of "3/14/15 1:30 PM."
If you wanted to extract just the hour from the timestamp, you can use
the HOUR function, e.g. =HOUR(A1) to extract the hour
value from cell A1. The hour will be displayed in 24-hour clock format, aka
military time, i.e., 7:00 AM is 7 while 7:00 PM
is 12 plus 7, i.e., 19; 12:00 AM (midnight) is 0 and 12:00 PM (noon) is 12.
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