Check gt3x v1 and v2 timestamp differences

[angerhang]

Thanks @chanshing for bringing this up.

Just to double check, is this line correct?: https://github.com/activityMonitoring/biobankAccelerometerAnalysis/blame/6021de453950e464737373cd62ea7c6a6af3a391/java/ActigraphReader.java#L479 Also, I see that in some parts firstSampleTime is multplied by 1000 to get seconds: https://github.com/activityMonitoring/biobankAccelerometerAnalysis/blame/6021de453950e464737373cd62ea7c6a6af3a391/java/ActigraphReader.java#L525 but in other places it's not: https://github.com/activityMonitoring/biobankAccelerometerAnalysis/blame/6021de453950e464737373cd62ea7c6a6af3a391/java/ActigraphReader.java#L380 Are these correct?

[angerhang]

We should check this before PR https://github.com/activityMonitoring/biobankAccelerometerAnalysis/pull/70 is merged!

[chanshing]

I believe this is fixed. Re-open otherwise.