This page contains automated test results for code from O'Reilly's Ruby Cookbook. If this code looks interesting or useful, you might want to buy the whole book.

Checking Whether Daylight Saving Time Is Currently in Effect
CodeExpectedActual
Time.local(2006, 1, 1)
 Sun Jan 01 00:00:00 EST 2006 Sun Jan 01 00:00:00 EST 2006 
Time.local(2006, 1, 1).isdst
 false false 
Time.local(2006, 10, 1)
 Sun Oct 01 00:00:00 EDT 2006 Sun Oct 01 00:00:00 EDT 2006 
Time.local(2006, 10, 1).isdst
 true true 
eastern = Time.local(2006, 10, 1)
 Sun Oct 01 00:00:00 EDT 2006 Sun Oct 01 00:00:00 EDT 2006 
eastern.isdst
 true true 
ENV['TZ'] = 'US/Pacific'
pacific = Time.local(2006, 10, 1)
 Sun Oct 01 00:00:00 PDT 2006 Sun Oct 01 00:00:00 PDT 2006 
pacific.isdst
 true true 
ENV['TZ'] = 'America/Phoenix'
arizona = Time.local(2006, 10, 1)
 Sun Oct 01 00:00:00 MST 2006 Sun Oct 01 00:00:00 MST 2006 
arizona.isdst
 false false 
ENV['TZ'] = nil
 
Daylight saving first took effect on March 31, 1918.
 






Time.local(1918, 3, 31).isdst

false
false





Time.local(1918, 4, 1).isdst

true
true





Time.local(1919, 4, 1).isdst

true
true





ENV['TZ'] = 'US/Pacific'
Time.local(1920, 4, 1)

Thu Apr 01 00:00:00 PST 1920
Thu Apr 01 00:00:00 PST 1920





ENV['TZ'] = nil
Time.local(1920, 4, 1)

Thu Apr 01 00:00:00 EDT 1920
Thu Apr 01 00:00:00 EDT 1920





Time.local(1942,2,9)

Mon Feb 09 00:00:00 EST 1942
Mon Feb 09 00:00:00 EST 1942





Time.local(1942,2,10)

Tue Feb 10 00:00:00 EWT 1942
Tue Feb 10 00:00:00 EWT 1942





Time.local(2007, 3, 13)

Tue Mar 13 00:00:00 EDT 2007
Tue Mar 13 00:00:00 EDT 2007