在Docker中运行关于时间的代码发现总是出现特别奇怪的问题，比如：应该白天出现的时间总是显示在半夜。通过命令date发现，时区不是当前所在时区。查阅资料后，一个适合自己的时区修改方式如下：
dpkg-reconfigure tzdata
初始时大概会报错：需要安装tzdata安装包
/usr/sbin/dpkg-reconfigure: tzdata is not installed
安装之后，便可以根据提示，选择自己想要设置的时区。比如我选择北京时间（上海）：
Please select the geographic area in which you live. Subsequent configuration questions will narrow this down by presenting a list of cities, representing the time zones in which they are located. 1. Africa 2. America 3. Antarctica 4. Australia 5. Arctic 6. Asia 7. Atlantic 8. Europe 9. Indian 10. Pacific 11. SystemV 12. US 13. Etc
Please select the city or region corresponding to your time zone. 1. Aden 11. Baku 21. Damascus 31. Hong_Kong 41. Kashgar 51. Makassar 61. Pyongyang 71. Singapore 81. Ujung_Pandang 2. Almaty 12. Bangkok 22. Dhaka 32. Hovd 42. Kathmandu 52. Manila 62. Qatar 72. Srednekolymsk 82. Ulaanbaatar 3. Amman 13. Barnaul 23. Dili 33. Irkutsk 43. Khandyga 53. Muscat 63. Qostanay 73. Taipei 83. Urumqi 4. Anadyr 14. Beirut 24. Dubai 34. Istanbul 44. Kolkata 54. Nicosia 64. Qyzylorda 74. Tashkent 84. Ust-Nera 5. Aqtau 15. Bishkek 25. Dushanbe 35. Jakarta 45. Krasnoyarsk 55. Novokuznetsk 65. Rangoon 75. Tbilisi 85. Vientiane 6. Aqtobe 16. Brunei 26. Famagusta 36. Jayapura 46. Kuala_Lumpur 56. Novosibirsk 66. Riyadh 76. Tehran 86. Vladivostok 7. Ashgabat 17. Chita 27. Gaza 37. Jerusalem 47. Kuching 57. Omsk 67. Sakhalin 77. Tel_Aviv 87. Yakutsk 8. Atyrau 18. Choibalsan 28. Harbin 38. Kabul 48. Kuwait 58. Oral 68. Samarkand 78. Thimphu 88. Yangon 9. Baghdad 19. Chongqing 29. Hebron 39. Kamchatka 49. Macau 59. Phnom_Penh 69. Seoul 79. Tokyo 89. Yekaterinburg 10. Bahrain 20. Colombo 30. Ho_Chi_Minh 40. Karachi 50. Magadan 60. Pontianak 70. Shanghai 80. Tomsk 90. Yerevan
修改前后时间对比：
Local time is now: Fri Nov 26 19:50:17 CST 2021. Universal Time is now: Fri Nov 26 11:50:17 UTC 2021.
