Time Zone

[Larry Smith Partners]

Is there any resource available to determine the actual time zone in use in Chicago, IL on Apri1 1-5, 1936

[Ivan Ferreira]

Maybe zdump -v? I don't understadn your question. Please also see: http://tldp.org/HOWTO/TimePrecision-HOWTO/

[Pieter 't Hart]

you could try if http://www.ntp.org/documentation.html
links to a document with the required information.

It looks like timezones are defined by a US-law.
http://tycho.usno.navy.mil/260.html
http://www.law.cornell.edu/search/index.html

[Pieter 't Hart]

this looks likes the official info
http://uscode.house.gov/uscode-cgi/fastweb.exe?getdoc+uscview+t13t16+1001+4++%28time%20ADJ%20zone%29%20%20%20%20%20%20%20%20%20%20
seach keywords was on "time ADJ zone"

[Martin Moore]

zdump -v does show you what Tru64 believes to have been in effect for the dates in question:

$ zdump -v :America/Chicago | grep 1936
:America/Chicago Sun Mar 1 07:59:59 1936 GMT = Sun Mar 1 01:59:59 1936 CST isdst=0 gmtoff=-21600
:America/Chicago Sun Mar 1 08:00:00 1936 GMT = Sun Mar 1 03:00:00 1936 EST isdst=0 gmtoff=-18000
:America/Chicago Sun Nov 15 06:59:59 1936 GMT = Sun Nov 15 01:59:59 1936 EST isdst=0 gmtoff=-18000
:America/Chicago Sun Nov 15 07:00:00 1936 GMT = Sun Nov 15 01:00:00 1936 CST isdst=0 gmtoff=-21600

This shows that the Chicago time zone went to DST (from CST to CDT) on March 1, 1936, and went back to standard time (CDT to CST) on Nov. 15, 1936. So CDT would have been in effect from April 1-5.

Martin