trial  time  day  month  year  time_zone_diff  lat        lon         
1      1637  2    July   2013  -4              33.35012   -79.19494   
2      0723  5    July   2013  -4              33.35012   -79.19494   
3      1102  5    July   2013  -4              33.35012   -79.19494   
4      0730  6    July   2013  -4              33.35012   -79.19494   
5      1028  6    July   2013  -4              33.35012   -79.19494