This timestamp may be converted in EXCEL by using the following formula and choosing the option for the "1904 base":

=(x+((365*66+17)*86400))/86400

If the "1900 base" is selected, then change the "66" value to "70".

In Excel Date 0.41667 = 10 hours

What I ended up using:

=((B25+((365*70+19)*86400))/86400)-0.41667

Sample Spreadsheet extract: