This should take care of the %z GNU extension for systems that don't have it like Solaris, or mal-support it via Python, like RHEL family of OSes. 
This should take care of the %z GNU extension for systems that don't have
it like Solaris, or mal-support it via Python, like RHEL family of OSes. 

And the offset between gmtime and localtime will actually change, i.e.:

$ date -Is
2012-03-08T10:20:25-0800

$ date -d '+1 week' -Is
2012-03-15T11:20:47-0700



pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus