在主流UNIX和linux的OS中，如何修改时区（timezone）？
解决方案：
一、Linux（Redhat and Suse）：
1、在/usr/share/zoneinfo/目录下查询想要更换的时区名称，修改格式同上
2、将原有的localtime文件移走；
# mv /etc/localtime /etc/localtime-old
3、做新的localtime文件，将对应的时区文件链接过来
# ln -s /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
4、与硬件（bios）同步
# /sbin/hwclock --systohc
二、Unix系统（不包括Linux），可以通过echo $TZ来查看当前时区。
在solaris中，修改时区需要修改/etc/TIMEZONE文件，其中的TZ=PRC就表示中国时区，我们可以将其替换为TZ=US/Pacific，再重启机器，就将时区修改为美国太平洋时区了。需要注意三点：
1、在X86的机器上，需要再执行如下命令，更新/etc/rtc_config文件：
# rtc -z zone-name（这里的zone-name就是/etc/TIMEZONE中TZ的值）
# rtc -c
2、到底有多少时区可以选择呢？我们可以进入/usr/share/lib/zoneinfo目录，其中有很多目录，包括US，也有很多文件，比如PRC；这表示US下还有很多时区，而PRC就是统一的时区。正因为如此，我们才看到TZ=PRC和TZ=US/Pacific这两种不同的形式。
3、需要重启系统使之生效。
三、AIX：
1、查看当前时区（其他操作系统使用date命令即可）
#cat /etc/environment （查找TZ所在行）
2、为了妥善起见，建议使用smit修改时区
#smit chtz
3、所有的时区信息在/usr/share/lib/zoneinfo目录
四、HPUX：
# set_parms timezone，可以通过交互的方式来修改时区。
UNIX and linux in the mainstream of the OS, how to modify the time zone (timezone)?
Solution:
1, Linux (Redhat and Suse):
1, in the / usr / share / zoneinfo / directory inquiries, the time zone you want to replace the name, modify the format Ibid
2, will remove the original file localtime;
# Mv / etc / localtime / etc / localtime-old
3, do localtime new documents, will be the corresponding time zone file link from
# Ln-s / usr / share / zoneinfo / Asia / Shanghai / etc / localtime
4, and hardware (bios) synchronization
# / Sbin / hwclock - systohc
Second, Unix system (not including Linux), can echo $ TZ to see the current time zone.
In solaris, the modifications need to modify the time zone / etc / TIMEZONE file, which indicated that TZ = PRC on the Chinese time zone, we can replace TZ = US / Pacific, and then restart the machine, it will be revised to the United States time zone the Pacific time zone. Need to pay attention to three points:
1, the machine in the X86, the need to implement the following command to update the / etc / rtc_config documents:
# Rtc-z zone-name (here, zone-name is / etc / TIMEZONE values in TZ)
# Rtc-c
2, in the end the number of time zones can be a choice? We can enter the / usr / share / lib / zoneinfo directory, of which there are many directories, including the US, there are many documents, such as the PRC; This means that there are still many under the US time zones, and the PRC is a unified time zone. This is why we only see the TZ = PRC and TZ = US / Pacific these two different forms.
3, the need to reboot the system to bring it into force.
Third, AIX:
1, view the current time zone (other operating systems can use the date command)
# cat / etc / environment (where the line to find TZ)
2, in order to properly sake, it is proposed to amend the use of time zone smit
# smit chtz
3, all of the time zone information in / usr / share / lib / zoneinfo directory
Fourth, HPUX:
# Set_parms timezone, can interact to modify the time zone.
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