Convert A Datetime String To Millisecond Unix Time Stamp

I'm trying to correlate the timing information obtain from a java job and linux performance monitoring tool perf (specifically perf stat). The timing information from java is obtai

Solution 1:

I think figured out the problem. Looks like foobar function is returning time in GMT+2, whereas the java job was returning time in GMT. so with a timedelta of +2, I could solve it.