The Tzdata package contains time zone and daylight-saving time data.
![[Note]](../images/note.png)
The tzdata tar file does not extract to a single directory as the other tar files do. To unpack, use:
mkdir -pv /sources/tzdata-2015d cd /sources/tzdata-2015d tar -x -f ../tzdata2015d.tar.gz
Install and set up the timezone data to a temporary directory with the following:
ZONEINFO=debian/tmp/usr/share/zoneinfo
mkdir -pv $ZONEINFO/{posix,right}
for tz in etcetera southamerica northamerica europe africa antarctica \
asia australasia backward pacificnew systemv; do
zic -L /dev/null -d $ZONEINFO -y "sh yearistype.sh" ${tz}
zic -L /dev/null -d $ZONEINFO/posix -y "sh yearistype.sh" ${tz}
zic -L leapseconds -d $ZONEINFO/right -y "sh yearistype.sh" ${tz}
done
cp -v zone.tab zone1970.tab iso3166.tab $ZONEINFO
zic -d $ZONEINFO -p America/New_York
unset ZONEINFO
The meaning of the zic commands:
zic -L /dev/null
...
This creates posix timezones, without any leap seconds. It is
conventional to put these in both zoneinfo and zoneinfo/posix. It is necessary to put the
POSIX timezones in zoneinfo,
otherwise various test-suites will report errors. On an
embedded system, where space is tight and you do not intend
to ever update the timezones, you could save 1.9MB by not
using the posix directory, but
some applications or test-suites might produce some failures.
zic -L
leapseconds ...
This creates right timezones, including leap seconds. On an
embedded system, where space is tight and you do not intend
to ever update the timezones, or care about the correct time,
you could save 1.9MB by omitting the right directory.
zic ... -p
...
This creates the posixrules
file. We use New York because POSIX requires the daylight
savings time rules to be in accordance with US rules.
Create the package archive:
buildpkg
Install the package:
dpkg -i ../tzdata_2015d_*.deb
One way to determine the local time zone is to run the following script:
tzselect
After answering a few questions about the location, the script will
output the name of the time zone (e.g., America/Edmonton). There are also some
other possible timezones listed in /usr/share/zoneinfo such as Canada/Eastern or EST5EDT that are not identified by the
script but can be used.
Then create the /etc/localtime file
by running:
ln -sfv /usr/share/zoneinfo/<xxx> /etc/localtime
Replace <xxx> with
the name of the time zone selected (e.g., Canada/Eastern).
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Provides timezone and daylight saving time information for glibc time functions |