The time zone option including DST information in the 'TZ-Posix String' format as defined in RFC 4833. If this attribute is not the zero-length string the UE MUST perform the time correction during the daylight saving time per this value and ignore the value of pktcEUERSTCIDDisDSTFlag and pktcEUERSTCIDDisTimeAdj If not configured, this attribute takes the value of the timezone acquired by the host system the UE resides or defaults to the zero-length string. For example, an EUE reports the value of the TZ-Posix string provided in RFC 4833 DHCPv4 option 'TZ-POSIX String' or DHCPv6 option code OPTION_NEW_POSIX_TIMEZONE from the CM. The following clarifications apply to the 'TZ-Posix String' expression: Given the TZ-Posix String as : stdoffset[dst[offset][,start[/time],end[/time]]] The EUE may ignore the time zone abbreviation associated with the 'std' and 'dst' expressions or may use them as part of a particular time output formatting (e.g., display time with timezone local abbreviation). The EUE is not required to support the parsing of the 'start' and 'end' expressions in Julian and zero-based Julian day. The EUE MUST apply the default values to the optional components in the TZ-Posiz String.