In CSV exported GPS track, there is no date specified, only time of day. I suggest adding date as well, either for all data points or only the start (and end?) point (could then be in the header).
I also suggest it is in the non-ambiguous format like this (four numbers for year, letters for month, year-month-day)
2012 jan 09
and why not also day of the week and perhaps time zone if easily found?
Thanks!