Added a contributed tz to DateTime

lib/python/DateTime/DateTime.py

@@ -84,7 +84,7 @@
 ##############################################################################
 """Encapsulation of date/time values"""
 
-__version__='$Revision: 1.33 $'[11:-2]
+__version__='$Revision: 1.34 $'[11:-2]
 
 
 import sys, os, math, regex, DateTimeZone
@@ -250,7 +250,8 @@ class _cache:
            'mewt':'GMT+1', 'swt':'GMT+1', 'fwt':'GMT+1', 'eet':'GMT+2',
            'bt':'GMT+3', 'zp4':'GMT+4', 'zp5':'GMT+5', 'zp6':'GMT+6',
            'wast':'GMT+7', 'cct':'GMT+8', 'jst':'GMT+9', 'east':'GMT+10',
-           'gst':'GMT+10', 'nzt':'GMT+12', 'nzst':'GMT+12', 'idle':'GMT+12'
+           'gst':'GMT+10', 'nzt':'GMT+12', 'nzst':'GMT+12', 'idle':'GMT+12',
+           'ret':'GMT+4'
            }