Notes:
Valid timezone strings in teradatamlspk:
1. Strings that follow different DST and standard time zone displacements:
    'Africa Egypt'
    'Africa Morocco'
    'Africa Namibia'
    'America Alaska'
    'America Aleutian'
    'America Argentina'
    'America Atlantic'
    'America Brazil'
    'America Central'
    'America Chile'
    'America Cuba'
    'America Eastern'
    'America Mountain'
    'America Newfoundland'
    'America Pacific'
    'America Paraguay'
    'America Uruguay'
    'Asia Gaza'
    'Asia Iran'
    'Asia Iraq'
    'Asia Irkutsk'
    'Asia Israel'
    'Asia Jordan'
    'Asia Kamchatka'
    'Asia Krasnoyarsk'
    'Asia Lebanon'
    'Asia Magadan'
    'Asia Omsk'
    'Asia Syria'
    'Asia Vladivostok'
    'Asia West Bank'
    'Asia Yakutsk'
    'Asia Yekaterinburg'
    'Australia Central'
    'Australia Eastern'
    'Australia Western'
    'Europe Central'
    'Europe Eastern'
    'Europe Kaliningrad'
    'Europe Moscow'
    'Europe Samara'
    'Europe Western'
    'Indian Mauritius'
    'Mexico Central'
    'Mexico Northwest'
    'Mexico Pacific'
    'Pacific New Zealand'
    'Pacific Samoa'

2. Strings that do not follow separate DST and standard time zone displacements
    'GMT'
    'GMT+1'
    'GMT+10'
    'GMT+11'
    'GMT+11:30'
    'GMT+12'
    'GMT+13'
    'GMT+14'
    'GMT+2'
    'GMT+3'
    'GMT+3:30'
    'GMT+4'
    'GMT+4:30'
    'GMT+5'
    'GMT+5:30'
    'GMT+5:45'
    'GMT+6'
    'GMT+6:30'
    'GMT+7'
    'GMT+8'
    'GMT+8:45'
    'GMT+9'
    'GMT+9:30'
    'GMT-1'
    'GMT-10'
    'GMT-11'
    'GMT-2'
    'GMT-3'
    'GMT-4'
    'GMT-5'
    'GMT-6'
    'GMT-6:30'
    'GMT-7'
    'GMT-8'

3. Timezone value between INTERVAL '-12:59' HOUR TO MINUTE and INTERVAL '14:00' HOUR TO MINUTE.