cast    cruise_id    year    lat        lon         mon    day    time       ISO_DateTime_UTC           yrday_utc    
1       CH0912       2012    32.4958    -76.1938    11     02     1012.33    2012-11-02T10:12:20Z       307.42523    
2       CH0912       2012    32.9800    -75.9263    11     02     1646.27    2012-11-02T16:46:16Z       307.69880