Ensure that fractional seconds are included when generating Unix times

Author: jameswilburlewis

pyspedas/tplot_tools/importers/netcdf_to_tplot.py

@@ -26,7 +26,7 @@ def change_time_to_unix_time(time_var):
     dates = num2date(time_var[:], units=units)
     unix_times = list()
     for date in dates:
-        unix_time = calendar.timegm(date.timetuple())
+        unix_time = calendar.timegm(date.timetuple()) + date.microsecond/1e6
         unix_times.append(unix_time)
     return unix_times