有的时候CentOS的时区不是我们想要的时区，就需要修改一下。下面介绍一下修改时区的方法：
首先，登录到server上，输入date查看时间及时区：
1 [root@robot-sv8-pod6 ~]# date 2 3 Thu Jan 4 21:37:53 EST 2018
可以看到时区是美东时间，现在我需要把它修改为美国西部时间，即太平洋时间。
输入tzselect,选2) Americas>49) United States>21) Pacific>1) Yes
1 [root@robot-sv8-pod6 ~]# teselect 2 -bash: teselect: command not found 3 [root@robot-sv8-pod6 ~]# tzselect 4 Please identify a location so that time zone rules can be set correctly. 5 Please select a continent or ocean. 6 1) Africa 7 2) Americas 8 3) Antarctica 9 4) Arctic Ocean 10 5) Asia 11 6) Atlantic Ocean 12 7) Australia 13 8) Europe 14 9) Indian Ocean 15 10) Pacific Ocean 16 11) none - I want to specify the time zone using the Posix TZ format. 17 #? 2 18 Please select a country. 19 1) Anguilla 19) Dominican Republic 37) Peru 20 2) Antigua & Barbuda 20) Ecuador 38) Puerto Rico 21 3) Argentina 21) El Salvador 39) St Barthelemy 22 4) Aruba 22) French Guiana 40) St Kitts & Nevis 23 5) Bahamas 23) Greenland 41) St Lucia 24 6) Barbados 24) Grenada 42) St Maarten (Dutch) 25 7) Belize 25) Guadeloupe 43) St Martin (French) 26 8) Bolivia 26) Guatemala 44) St Pierre & Miquelon 27 9) Brazil 27) Guyana 45) St Vincent 28 10) Canada 28) Haiti 46) Suriname 29 11) Caribbean NL 29) Honduras 47) Trinidad & Tobago 30 12) Cayman Islands 30) Jamaica 48) Turks & Caicos Is 31 13) Chile 31) Martinique 49) United States 32 14) Colombia 32) Mexico 50) Uruguay 33 15) Costa Rica 33) Montserrat 51) Venezuela 34 16) Cuba 34) Nicaragua 52) Virgin Islands (UK) 35 17) Curacao 35) Panama 53) Virgin Islands (US) 36 18) Dominica 36) Paraguay 37 #? 49 38 Please select one of the following time zone regions. 39 1) Eastern (most areas) 16) Central - ND (Morton rural) 40 2) Eastern - MI (most areas) 17) Central - ND (Mercer) 41 3) Eastern - KY (Louisville area) 18) Mountain (most areas) 42 4) Eastern - KY (Wayne) 19) Mountain - ID (south); OR (east) 43 5) Eastern - IN (most areas) 20) MST - Arizona (except Navajo) 44 6) Eastern - IN (Da, Du, K, Mn) 21) Pacific 45 7) Eastern - IN (Pulaski) 22) Alaska (most areas) 46 8) Eastern - IN (Crawford) 23) Alaska - Juneau area 47 9) Eastern - IN (Pike) 24) Alaska - Sitka area 48 10) Eastern - IN (Switzerland) 25) Alaska - Annette Island 49 11) Central (most areas) 26) Alaska - Yakutat 50 12) Central - IN (Perry) 27) Alaska (west) 51 13) Central - IN (Starke) 28) Aleutian Islands 52 14) Central - MI (Wisconsin border) 29) Hawaii 53 15) Central - ND (Oliver) 54 #? 21 55 56 The following information has been given: 57 58 United States 59 Pacific 60 61 Therefore TZ='America/Los_Angeles' will be used. 62 Local time is now: Thu Jan 4 18:40:32 PST 2018. 63 Universal Time is now: Fri Jan 5 02:40:32 UTC 2018. 64 Is the above information OK? 65 1) Yes 66 2) No 67 #? 1 68 69 You can make this change permanent for yourself by appending the line 70 TZ='America/Los_Angeles'; export TZ 71 to the file '.profile' in your home directory; then log out and log in again. 72 73 Here is that TZ value again, this time on standard output so that you 74 can use the /usr/bin/tzselect command in shell scripts: 75 America/Los_Angeles
然后需要更改系统时区，即删除原来的local time，将新的时区链接到localtime。
[root@robot-sv8-pod6 ~]# rm -f /etc/localtime [root@robot-sv8-pod6 ~]# ln -s /usr/share/zoneinfo/America/Los_Angeles /etc/localtime [root@robot-sv8-pod6 ~]# date Thu Jan 4 18:55:23 PST 2018