# tzselect  Please identify a location so that time zone rules can be set correctly. Please select a continent or ocean.  1) Africa  2) Americas  3) Antarctica  4) Arctic Ocean  5) Asia  6) Atlantic Ocean  7) Australia  8) Europe  9) Indian Ocean 10) Pacific Ocean 11) none - I want to specify the time zone using the Posix TZ format. #? 5 Please select a country.  1) Afghanistan           18) Israel                35) Palestine  2) Armenia               19) Japan                 36) Philippines  3) Azerbaijan            20) Jordan                37) Qatar  4) Bahrain               21) Kazakhstan            38) Russia  5) Bangladesh            22) Korea (North)         39) Saudi Arabia  6) Bhutan                23) Korea (South)         40) Singapore  7) Brunei                24) Kuwait                41) Sri Lanka  8) Cambodia              25) Kyrgyzstan            42) Syria  9) China                 26) Laos                  43) Taiwan 10) Cyprus                27) Lebanon               44) Tajikistan 11) East Timor            28) Macau                 45) Thailand 12) Georgia               29) Malaysia              46) Turkmenistan 13) Hong Kong             30) Mongolia              47) United Arab Emirates 14) India                 31) Myanmar (Burma)       48) Uzbekistan 15) Indonesia             32) Nepal                 49) Vietnam 16) Iran                  33) Oman                  50) Yemen 17) Iraq                  34) Pakistan #? 9 Please select one of the following time zone regions. 1) Beijing Time 2) Xinjiang Time #? 1 The following information has been given:         China         Beijing Time Therefore TZ='Asia/Shanghai' will be used. Local time is now:      Fri Jan  4 16:02:54 CST 2019. Universal Time is now:  Fri Jan  4 08:02:54 UTC 2019. Is the above information OK? 1) Yes 2) No #? 1 You can make this change permanent for yourself by appending the line         TZ='Asia/Shanghai'; export TZ to the file '.profile' in your home directory; then log out and log in again. Here is that TZ value again, this time on standard output so that you can use the /usr/bin/tzselect command in shell scripts: Asia/Shanghai

  rm -f /etc/localtime   ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

hwclock --show

hwclock --set --date="10/22/18 22:00"

hwclock --hctosys

vim /etc/timezone  Asia/Shanghai

# timedatectl        Local time: 五 2019-01-04 15:57:15 CET   Universal time: 五 2019-01-04 14:57:15 UTC         RTC time: 五 2019-01-04 15:57:15        Time zone: Asia/Shanghai (CET, +0100)      NTP enabled: yes NTP synchronized: no  RTC in local TZ: yes       DST active: no  Last DST change: DST ended at                   日 2018-10-28 02:59:59 CEST                   日 2018-10-28 02:00:00 CET  Next DST change: DST begins (the clock jumps one hour forward) at                   日 2019-03-31 01:59:59 CET                   日 2019-03-31 03:00:00 CEST Warning: The system is configured to read the RTC time in the local time zone.          This mode can not be fully supported. It will create various problems          with time zone changes and daylight saving time adjustments. The RTC          time is never updated, it relies on external facilities to maintain it.          If at all possible, use RTC in UTC by calling          'timedatectl set-local-rtc 0'.