1234567890 seconds since Unix epoch

It was at 0447:54 or did I calculate wrong? Here's my proof. Just used the basic Windows calculator so it didn't save all the calculations or let me copy/paste and no way am I doing all that again, but here's how I ran the numbers...

1234567890 seconds
/60 to see what that is in minutes
/60 to see what that is in hours
/24 to see what that is in days
/365.25 to see what that is in years, accounting for leap years (39 and change)
-39 because we've got the year, 2009, leaves us with 44 and change
-31 for January, leaves us with 13 and change
-13 because we've got the exact date, leaves us with a long decimal number
*24 to see what hour it is, we get 4 and change
-4 since we now know the hour
*60 to see what the minute is, we get 47 and change
-47 since we know the minutes
*60 to see the seconds...
...but that leaves me with 54... and change. It should even out to an integer. So I messed up somewhere or Windows rounded it off somewhere.