Remove unused ISO 8601 stuff from Zipline

README.md

@@ -61,7 +61,6 @@ Dependencies
 * pandas (>= 0.9.0)
 * pytz
 * msgpack-python
-* iso8601
 * Logbook
 * blist
 

zipline/utils/date_utils.py

@@ -15,18 +15,9 @@
 
 
 import pytz
-import iso8601
 from datetime import datetime, timedelta
 
 
-# iso8061 utility
-# ---------------------
-def parse_iso8061(date_string):
-    dt = iso8601.parse_date(date_string)
-    dt = dt.replace(tzinfo=pytz.utc)
-    return dt
-
-
 # Epoch utilities
 # ---------------------
 UNIX_EPOCH = datetime(1970, 1, 1, 0, 0, tzinfo=pytz.utc)
@@ -64,11 +55,6 @@ def UN_EPOCH(ms_since_epoch):
     return dt
 
 
-def iso8061_to_epoch(datestring):
-    dt = parse_iso8061(datestring)
-    return EPOCH(dt)
-
-
 def epoch_now():
     dt = utcnow()
     return EPOCH(dt)