zyDateTimeZoneHourMinute

The time difference between UTC and your time zone. 
Time zone offset is half of hour.
Display Hint 1a1d:1d   e.g. + 8 30
field  octets  contents                  range
-----  ------  --------                  -----
  1       1    direction from UTC        '0x2b'(+) / '0x2d'(-)
  2       2    hours from UTC            0x0,0x1,0x2,0x3..0x9,0xa,0xb,0xc
  3       3    minutes from UTC          '0x00'(00) / '0x1e'(30)

MIB

ZYXEL-SYSTEM-MIB

OID

.1.3.6.1.4.1.890.1.15.3.82.1.13

Type

scalar

Access

readwrite

Status

current

Parent

zyxelDateTimeSetup