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I looked into this, and the modify function was not setting the
timezone information back to the parent dateobj. I have created a
patch that does this, IF the timezone information is set on the new
modified timestamp. It is attached to the bug itself, and here as
well.
This is, of course, assuming that date_modify() should actually modify
the timezone information. If this is intended functionality, then this
patch will fix it. If not, the bug should be closed as a no fix.
Thanks