If you take the first 11 digits of the first of those numbers, i.e.

12,884,129,034

Then this would appear to be seconds from 1st January 1601

If you divide that number by 86400 (the number of seconds in a day) then you get this number

149,121.9

If you count days from 1st January 1601 (including leap days) then you get a date of 13th April 2009 at 20:43 (although you might need to adjust for time zones)

The 2nd time is therefore 464 seconds or 7:44 minutes earlier.

If you can determine the exact time for one then you should be able to get a fix on the others......

regards, barry