Improvement: Date format in 'Parse X.509 certificate'

[n1474335]

Summary

Dates are currently formatted like this in the 'Parse X.509 certificate' operation:

Validity
  Not Before:     22/08/12 05:27:41 (dd-mm-yy hh:mm:ss) (120822052741Z)
  Not After:      21/08/17 05:27:41 (dd-mm-yy hh:mm:ss) (170821052741Z)

If a date is not in the 21st century, this will lead to confusion. The year should be expanded to show all digits rather than just the last two.