# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1422666977 -3600
# Node ID 9a1511da6126d321bf64ca9ab87ef22b0f30d50e
# Parent  b060f0b6e23835fc53da0e0cbe91be7afa2e41d3
Added important note about datetimes provided by free/busy lists.

diff -r b060f0b6e238 -r 9a1511da6126 imiptools/period.py
--- a/imiptools/period.py	Fri Jan 30 19:37:27 2015 +0100
+++ b/imiptools/period.py	Sat Jan 31 02:16:17 2015 +0100
@@ -108,6 +108,9 @@
 
     for t in periods:
         start, end = t[:2]
+
+        # NOTE: This only really works if the datetimes are UTC already.
+
         start = to_timezone(get_datetime(start), tzid)
         end = to_timezone(get_datetime(end), tzid)
         l.append((start, end) + tuple(t[2:]))