TimeZone

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Because people keep thinking that the "EST" in my `date` command must be incorrect...
 
Because people keep thinking that the "EST" in my `date` command must be incorrect...
   
#!/bin/bash
+
Please run the following command (debian styled linux has zdump in /usr/bin/, whilst redhat styled has it in /usr/sbin, whilst under solaris you'll need to change the find search path to /usr/share/lib/zoneinfo (and track down zdump, which I think will be in /usr/sbin, but don't quote me) :)
function dotz () {
 
while read i ; do
 
export TZ=$(echo $i | awk -F' ' '{print $3}')
 
OFFSET=$(date +%z)
 
TLA=$(date +%Z)
 
echo -e "$OFFSET\t$TLA\t$TZ" >> foo
 
done
 
}
 
grep -v "^#" /usr/share/zoneinfo/zone.tab > tz.list
 
dotz < tz.list
 
sort -k2 foo > timezones
 
   
See results at http://www.cheeky.house.cx/~nemo/extras/timezones
+
find /usr/share/zoneinfo -type f | xargs /usr/bin/zdump | grep EST
   
First columns is time offset, third column is the $TZ environment variable. The Second column is the time zone identifier, '''incorrectly assumed by most people to be unique'''. I can't find an RFC on it though :(
+
Now try it without the grep, and note all the time zone identifiers, ...these are '''incorrectly assumed by most people to be unique'''. I believe (without references) that the timezone acronyms are based on local names - there is no global cooperation in keeping the namespace clean.
  +
  +
----
  +
  +
Further notes: Looks like Aussie EST should properly be named AEST, but usually isn't, and that the namespace is relatively clean:
  +
http://en.wikipedia.org/wiki/List_of_time_zone_abbreviations

Latest revision as of 10:30, 22 September 2010

Because people keep thinking that the "EST" in my `date` command must be incorrect...

Please run the following command (debian styled linux has zdump in /usr/bin/, whilst redhat styled has it in /usr/sbin, whilst under solaris you'll need to change the find search path to /usr/share/lib/zoneinfo (and track down zdump, which I think will be in /usr/sbin, but don't quote me) :)

find /usr/share/zoneinfo -type f | xargs /usr/bin/zdump | grep EST

Now try it without the grep, and note all the time zone identifiers, ...these are incorrectly assumed by most people to be unique. I believe (without references) that the timezone acronyms are based on local names - there is no global cooperation in keeping the namespace clean.


Further notes: Looks like Aussie EST should properly be named AEST, but usually isn't, and that the namespace is relatively clean: http://en.wikipedia.org/wiki/List_of_time_zone_abbreviations

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