Going back to sharing DATETIME_STR constant

The constant can still be shared between the two
files as it was originally, it was not shared
temporarily for testing purposes

rss_update.py

@@ -1,6 +1,7 @@
 from random import randint
 import datetime
 
+from main import DATETIME_STR
 # updates the guid given in two places with the RSS file, essential for letting readers know
 # a new picture has been published
 
@@ -9,11 +10,6 @@ import datetime
 # also updates pubDate and lastBuildDate
 # finally, updates the image name as well
 
-# this will change between calls due to microseconds
-# better for it just to be a global
-DATETIME_STR = str(datetime.datetime.today()).replace(' ', "-")
-# we don't need those pesky microseconds any way
-DATETIME_STR = DATETIME_STR[:-7]
 def update_rss_feed(rss_file_name):
     rss_file = ""