Following are a list of time zones with their IDs.  If you would like to include the time zones when you upload, make sure you include the ID in the TimeZoneID field when you upload your CSV file.  GMTOffset is displayed here for reference only and is not included in the upload.  

ID Name GMTOffset
1 International Date Line West -12
2 Midway Island, Samoa -11
3 Hawaii -10
4 Alaska -9
5 Pacific Time (US & Canada) -8
6 Tijuana, Baja California -8
7 Arizona -7
8 Chihuahua, La Paz, Mazatlan - New -7
9 Chihuahua, La Paz, Mazatlan - Old -7
10 Mountain Time (US & Canada) -7
11 Central America -6
12 Central Time (US & Canada) -6
13 Guadalajara, Mexico City, Monterrey -6
14 Guadalajara, Mexico City, Monterrey -6
15 Saskatchewan -6
16 Bogota, Lima, Quito, Rio Branco -5
17 Eastern Time (US & Canada) -5
18 Indiana (East) -5
19 Atlantic Time (Canada) -4
20 Caracas, La Paz -4
21 Manaus -4
22 Santiago -4
23 Newfoundland -3.5
24 Brasilia -3
25 Buenos Aires, Georgetown -3
26 Greenland -3
27 Montevideo -3
28 Mid-Atlantic -2
29 Azores -1
30 Cape Verde Is. -1
31 Casablanca, Monrovia, Reykjavik 0
32 Greenwich Mean Time : Dublin, Edinburgh, Lisbon, London 0
33 Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna 1
34 Belgrade, Bratislava, Budapest, Ljubljana, Prague 1
35 Brussels, Copenhagen, Madrid, Paris 1
36 Sarajevo, Skopje, Warsaw, Zagreb 1
37 West Central Africa 1
38 Amman 2
39 Athens, Bucharest, Istanbul 2
40 Beirut 2
41 Cairo 2
42 Harare, Pretoria 2
43 Helsinki, Kjiv, Riga, Sofia, Talinn, Vilnius 2
44 Jerusalem 2
45 Minsk 2
46 Windhoek 2
47 Baghdad 3
48 Kuwait, Riyadh 3
49 Moscow, St. Petersburg, Volgograd 3
50 Nairobi 3
51 Tbilisi 3
52 Tehran 3.5
53 Abu Dhabi, Muscat 4
54 Baku 4
55 Caucasus Standard Time 4
56 Yerevan 4
57 Kabul 4.5
58 Ekaterinburg 5
59 Islamabad, Karachi, Tashkent 5
60 Chennai, Kolkata, Mumbai, New Delhi 5.5
61 Sri Jayawardenepure 5.5
62 Kathmandu 5.75
63 Almaty, Novosibirsk 6
64 Astana, Dhaka 6
65 Yangon (Rangoon) 6.5
66 Bangkok, Hanoi, Jakarta 7
67 Krasnoyarsk 7
68 Beijing, Chongqing, Hong Kong, Urumqi 8
69 Irkutsk, Ulaan Bataar 8
70 Kuala Lumpur, Singapore 8
71 Perth 8
72 Taipei 8
73 Osaka, Sapporo, Tokyo 9
74 Seoul 9
75 Yakutsk 9
76 Adelaide 9.5
77 Darwin 9.5
78 Brisbane 10
79 Canberra, Melbourne, Sydney 10
80 Guam, Port Moresby 10
81 Hobart 10
82 Vladivostok 10
83 Magadan, Solomon Is., New Caledonia 11
84 Auchland, Wellington 12
85 Fiji, Kamchatka, Marshall Is. 13
86 Nuku'alofa 13