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.  

IDNameGMTOffset
1International Date Line West-12
2Midway Island, Samoa-11
3Hawaii-10
4Alaska-9
5Pacific Time (US & Canada)-8
6Tijuana, Baja California-8
7Arizona-7
8Chihuahua, La Paz, Mazatlan - New-7
9Chihuahua, La Paz, Mazatlan - Old-7
10Mountain Time (US & Canada)-7
11Central America-6
12Central Time (US & Canada)-6
13Guadalajara, Mexico City, Monterrey-6
14Guadalajara, Mexico City, Monterrey-6
15Saskatchewan-6
16Bogota, Lima, Quito, Rio Branco-5
17Eastern Time (US & Canada)-5
18Indiana (East)-5
19Atlantic Time (Canada)-4
20Caracas, La Paz-4
21Manaus-4
22Santiago-4
23Newfoundland-3.5
24Brasilia-3
25Buenos Aires, Georgetown-3
26Greenland-3
27Montevideo-3
28Mid-Atlantic-2
29Azores-1
30Cape Verde Is.-1
31Casablanca, Monrovia, Reykjavik0
32Greenwich Mean Time : Dublin, Edinburgh, Lisbon, London0
33Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna1
34Belgrade, Bratislava, Budapest, Ljubljana, Prague1
35Brussels, Copenhagen, Madrid, Paris1
36Sarajevo, Skopje, Warsaw, Zagreb1
37West Central Africa1
38Amman2
39Athens, Bucharest, Istanbul2
40Beirut2
41Cairo2
42Harare, Pretoria2
43Helsinki, Kjiv, Riga, Sofia, Talinn, Vilnius2
44Jerusalem2
45Minsk2
46Windhoek2
47Baghdad3
48Kuwait, Riyadh3
49Moscow, St. Petersburg, Volgograd3
50Nairobi3
51Tbilisi3
52Tehran3.5
53Abu Dhabi, Muscat4
54Baku4
55Caucasus Standard Time4
56Yerevan4
57Kabul4.5
58Ekaterinburg5
59Islamabad, Karachi, Tashkent5
60Chennai, Kolkata, Mumbai, New Delhi5.5
61Sri Jayawardenepure5.5
62Kathmandu5.75
63Almaty, Novosibirsk6
64Astana, Dhaka6
65Yangon (Rangoon)6.5
66Bangkok, Hanoi, Jakarta7
67Krasnoyarsk7
68Beijing, Chongqing, Hong Kong, Urumqi8
69Irkutsk, Ulaan Bataar8
70Kuala Lumpur, Singapore8
71Perth8
72Taipei8
73Osaka, Sapporo, Tokyo9
74Seoul9
75Yakutsk9
76Adelaide9.5
77Darwin9.5
78Brisbane10
79Canberra, Melbourne, Sydney10
80Guam, Port Moresby10
81Hobart10
82Vladivostok10
83Magadan, Solomon Is., New Caledonia11
84Auchland, Wellington12
85Fiji, Kamchatka, Marshall Is.13
86Nuku'alofa13