I have explored the Region Setting page in SharePoint Site and get (Check this post on how I got the list) the below TimeZone Collections details.

ID

Description

2

(UTC) Dublin, Edinburgh, Lisbon, London

3

(UTC+01:00) Brussels, Copenhagen, Madrid, Paris

4

(UTC+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna

5

(UTC+02:00) Athens, Bucharest, Istanbul

6

(UTC+01:00) Belgrade, Bratislava, Budapest, Ljubljana, Prague

7

(UTC+02:00) Minsk (old)

8

(UTC-03:00) Brasilia

9

(UTC-04:00) Atlantic Time (Canada)

10

(UTC-05:00) Eastern Time (US and Canada)

11

(UTC-06:00) Central Time (US and Canada)

12

(UTC-07:00) Mountain Time (US and Canada)

13

(UTC-08:00) Pacific Time (US and Canada)

14

(UTC-09:00) Alaska

15

(UTC-10:00) Hawaii

16

(UTC+13:00) Samoa

17

(UTC+12:00) Auckland, Wellington

18

(UTC+10:00) Brisbane

19

(UTC+09:30) Adelaide

20

(UTC+09:00) Osaka, Sapporo, Tokyo

21

(UTC+08:00) Kuala Lumpur, Singapore

22

(UTC+07:00) Bangkok, Hanoi, Jakarta

23

(UTC+05:30) Chennai, Kolkata, Mumbai, New Delhi

24

(UTC+04:00) Abu Dhabi, Muscat

25

(UTC+03:30) Tehran

26

(UTC+03:00) Baghdad

27

(UTC+02:00) Jerusalem

28

(UTC-03:30) Newfoundland

29

(UTC-01:00) Azores

30

(UTC-02:00) Mid-Atlantic

31

(UTC) Monrovia, Reykjavik

32

(UTC-03:00) Cayenne, Fortaleza

33

(UTC-04:00) Georgetown, La Paz, Manaus, San Juan

34

(UTC-05:00) Indiana (East)

35

(UTC-05:00) Bogota, Lima, Quito

36

(UTC-06:00) Saskatchewan

37

(UTC-06:00) Guadalajara, Mexico City, Monterrey

38

(UTC-07:00) Arizona

39

(UTC-12:00) International Date Line West

40

(UTC+12:00) Fiji

41

(UTC+11:00) Solomon Is., New Caledonia

42

(UTC+10:00) Hobart

43

(UTC+10:00) Guam, Port Moresby

44

(UTC+09:30) Darwin

45

(UTC+08:00) Beijing, Chongqing, Hong Kong, Urumqi

46

(UTC+06:00) Novosibirsk (RTZ 5)

47

(UTC+05:00) Tashkent

48

(UTC+04:30) Kabul

49

(UTC+02:00) Cairo

50

(UTC+02:00) Harare, Pretoria

51

(UTC+03:00) Moscow, St. Petersburg, Volgograd (RTZ 2)

53

(UTC-01:00) Cabo Verde

54

(UTC+04:00) Baku

55

(UTC-06:00) Central America

56

(UTC+03:00) Nairobi

57

(UTC+01:00) Sarajevo, Skopje, Warsaw, Zagreb

58

(UTC+05:00) Ekaterinburg (RTZ 4)

59

(UTC+02:00) Helsinki, Kyiv, Riga, Sofia, Tallinn, Vilnius

60

(UTC-03:00) Greenland

61

(UTC+06:30) Yangon (Rangoon)

62

(UTC+05:45) Kathmandu

63

(UTC+08:00) Irkutsk (RTZ 7)

64

(UTC+07:00) Krasnoyarsk (RTZ 6)

65

(UTC-04:00) Santiago

66

(UTC+05:30) Sri Jayawardenepura

67

(UTC+13:00) Nuku'alofa

68

(UTC+10:00) Vladivostok, Magadan (RTZ 9)

69

(UTC+01:00) West Central Africa

70

(UTC+09:00) Yakutsk (RTZ 8)

71

(UTC+06:00) Astana

72

(UTC+09:00) Seoul

73

(UTC+08:00) Perth

74

(UTC+03:00) Kuwait, Riyadh

75

(UTC+08:00) Taipei

76

(UTC+10:00) Canberra, Melbourne, Sydney

77

(UTC-07:00) Chihuahua, La Paz, Mazatlan

78

(UTC-08:00) Baja California

79

(UTC+02:00) Amman

80

(UTC+02:00) Beirut

81

(UTC-04:00) Cuiaba

82

(UTC+04:00) Tbilisi

83

(UTC+01:00) Windhoek

84

(UTC+04:00) Yerevan

85

(UTC-03:00) Buenos Aires

86

(UTC) Casablanca

87

(UTC+05:00) Islamabad, Karachi

88

(UTC-04:30) Caracas

89

(UTC+04:00) Port Louis

90

(UTC-03:00) Montevideo

91

(UTC-04:00) Asuncion

92

(UTC+12:00) Petropavlovsk-Kamchatsky – Old

93

(UTC) Coordinated Universal Time

94

(UTC+08:00) Ulaanbaatar

95

(UTC-11:00) Coordinated Universal Time-11

96

(UTC-02:00) Coordinated Universal Time-02

97

(UTC+12:00) Coordinated Universal Time+12

98

(UTC+02:00) Damascus

99

(UTC+10:00) Magadan

100

(UTC+02:00) Kaliningrad (RTZ 1)

101

(UTC+02:00) Istanbul

102

(UTC+06:00) Dhaka

103

(UTC-03:00) Salvador

104

(UTC+02:00) E. Europe

106

(UTC+04:00) Izhevsk, Samara (RTZ 3)

107

(UTC+11:00) Chokurdakh (RTZ 10)

108

(UTC+12:00) Anadyr, Petropavlovsk-Kamchatsky (RTZ 11)

109

(UTC+03:00) Minsk