Change time zones in Mac OS X Snow Leopard

Introduction

In connection with the cancellation of the transition to summer / winter time is dedicated.



On Mac OS X, time zone settings are in two places: / etc / localtime and /usr/share/icu/icudtXXX.dat.

/ etc / localtime, which is a symbolic link to / usr / share / zoneinfo / [set by the time zone, for example Europe / Moscow], sets the time zone settings for the console.

System clocks, Mail applications and others take time zone settings from /usr/share/icu/icudtXXX.dat.



October 30, 2011 I have the following: in Terminal and various console utilities, the time is correct (localtime has been updated in advance), and in Mail, the system clock and so on is an hour behind.

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Solution to the problem

Modifying / etc / localtime

• Download the current version of tzdata (I used tzdata2011l.tar.gz, the latest version can be found here ).
• Unpacking ( tar xzf ./tzdata2011l.tar.gz ).
• Apply ( sudo zic europe ).
• Checking ( zdump -v / etc / localtime | grep 2011 ).

It should look like this:

eth0-loth:~$ zdump -v /etc/localtime | grep 2011

/etc/localtime Sat Mar 26 22:59:59 2011 UTC = Sun Mar 27 01:59:59 2011 MSK isdst=0

/etc/localtime Sat Mar 26 23:00:00 2011 UTC = Sun Mar 27 03:00:00 2011 MSK isdst=0

As you can see, the March transition is indicated, and the October one has disappeared.

Modification /usr/share/icu/icudtXXX.dat

I have Xcode, so I compiled the file directly from myself.

• Download the source code ICU (take here ).
• Unpack:
  
  tar xzf ICU-400.42.tar.gz
  
  cd ICU-400.42 / icuSources
• Copy the current tzdata to the source:
  
  cp ~ / tzdata2011l.tar.gz ./tools/tzcode/
• We compile and compile:
  
  ./runConfigureICU MacOSX --with-data-packaging = archive
  
  gmake
• Make a backup:
  
  cp /usr/share/icu/icudt40l.dat ~
• Install the file:
  
  sudo install -o root -g wheel -m 0644 -Sp data / out / icudt40l.dat /usr/share/icu/icudt40l.dat
• For final use, reboot.

Conclusion

All the above was checked on Mac OS X Snow Leopard 10.6.8. As a result, we have the correct time zone (Europe / Moscow), included ntp synchronization and the correct time in all applications.



PS It is worth noting that when trying to build a later version of icu (icudt46l), the system was unstable.



PPS Thanks gag_fenix for an invite!



UPD: Compiled icudt40l.dat file ( here ) and Moscow zone file ( here ).