DateDifference["2013-06-20T18:47:01.41","2013-06-21T03:22:34.59","Hour"]

syslog=Import["/Volumes/ProjectLibrary/900502.BenthicRover/Rover.Deployment/Pulse_62/dep-2013.06.19-04-pulse-62/data-01-system_logs/syslog.csv"];

syslog[[1]]

times=Flatten[syslog[[All,{1}]]];

Length[times]

times[[1;;10]]

StringLength[times[[1]]]

timesfilt=Select[times,StringLength[#]==22&];

Length[timesfilt]

times1=Partition[Riffle[timesfilt,1],2];

times1[[1;;10]]

times[[-1]]

DateListPlot[times1,PlotRange->All]

DateListPlot[times1,PlotRange->All,Filling->Axis,PlotLabel->"Rover Pulse 62 Syslog Entry Times",FrameLabel->{"Date","Filled means entry"}]