jsec2time
This application converts Julian seconds to date.
# calling jsec2time
$ ./jsec2time <jsec>
Converting exemplarily Julian seconds of 539314401.00 after the 1. January 2000 in date results in:
./jsec2time 539314401.00
2017 2 2 1 0 0 0 0.11
Thus, Julian seconds of 539314401.00 correspond to 2 February 2017 at 01:00:00.11.