Description: ** This object is optional **
Timestamp when this cartridge was imported.
Compatible with the SMIv2 DateAndTime
textual convention.  Encode is as follows:

 field  octets  contents                  range
 -----  ------  --------                  -----
   1      1-2   year                      0..65536
   2       3    month                     1..12
   3       4    day                       1..31
   4       5    hour                      0..23
   5       6    minutes                   0..59
   6       7    seconds                   0..60
                (use 60 for leap-second)
   7       8    deci-seconds              0..9
   8       9    direction from UTC        '+' / '-'
   9      10    hours from UTC            0..11
  10      11    minutes from UTC          0..59

For example, Tuesday May 26, 1992 at 1:30:15 PM EDT would be
displayed as:

                 1992-5-26,13:30:15.0,-4:0

Note that if only local time is known, then timezone
information (fields 8-10) is not present.