Convert time in milliseconds to hh:mm:ss.fff format in an Excel spreadsheet

Hello,

I have an SSIS package that runs a query to produce an Excel spreadsheet.  Two of the columns are a run time in milliseconds (which is calculated) and the other column is a formatted time in milliseconds that I need to show as hh:mm:ss.fff. For example, 4990 and 00:00:04.990  .  What would be the best way to produce the formatted time column?