Add timetools.py.

I realize this is kind of stupid, but it means I never have to think
about the correct incantation again, and all my projects will
be on the same page with regards to correct utc timestamp.

voussoirkit/timetools.py

@@ -0,0 +1,7 @@
+import datetime
+
+def now():
+    return datetime.datetime.now(tz=datetime.timezone.utc)
+
+def now_local():
+    return datetime.datetime.now().astimezone()