diff --git a/cli/timesince.py b/cli/timesince.py
new file mode 100755
index 0000000..00a417e
--- /dev/null
+++ b/cli/timesince.py
@@ -0,0 +1,83 @@
+#
+# Copyright (c) 2011,2012,2013 Big Switch Networks, Inc.
+#
+# Licensed under the Eclipse Public License, Version 1.0 (the
+# "License"); you may not use this file except in compliance with the
+# License. You may obtain a copy of the License at
+#
+#      http://www.eclipse.org/legal/epl-v10.html
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied. See the License for the specific language governing
+# permissions and limitations under the License.
+#
+
+import datetime
+
+def ungettext(a,b,count):
+    if count > 1: # plural
+        return b
+    return a
+
+def ugettext(a):
+    return a
+
+def timesince_sec(since):
+    chunks = (
+      (60 * 60 * 24 * 365, lambda n: ungettext('year', 'years', n)),
+      (60 * 60 * 24 * 30, lambda n: ungettext('month', 'months', n)),
+      (60 * 60 * 24 * 7, lambda n : ungettext('week', 'weeks', n)),
+      (60 * 60 * 24, lambda n : ungettext('day', 'days', n)),
+      (60 * 60, lambda n: ungettext('hour', 'hours', n)),
+      (60, lambda n: ungettext('minute', 'minutes', n))
+    )
+    for i, (seconds, name) in enumerate(chunks):
+        count = since // seconds
+        if count != 0:
+            break
+    s = ugettext('%(number)d %(type)s') % {'number': count, 'type': name(count)}
+    if i + 1 < len(chunks):
+        # Now get the second item
+        seconds2, name2 = chunks[i + 1]
+        count2 = (since - (seconds * count)) // seconds2
+        if count2 != 0:
+            s += ugettext(', %(number)d %(type)s') % {'number': count2, 'type': name2(count2)}
+    return s
+    
+def timesince(d, now=None):
+    
+    """
+    Takes two datetime objects and returns the time between d and now
+    as a nicely formatted string, e.g. "10 minutes".  If d occurs after now,
+    then "0 minutes" is returned.
+
+    Units used are years, months, weeks, days, hours, and minutes.
+    Seconds and microseconds are ignored.  Up to two adjacent units will be
+    displayed.  For example, "2 weeks, 3 days" and "1 year, 3 months" are
+    possible outputs, but "2 weeks, 3 hours" and "1 year, 5 days" are not.
+
+    Adapted from http://blog.natbat.co.uk/archive/2003/Jun/14/time_since
+    """
+    # Convert datetime.date to datetime.datetime for comparison.
+    if not isinstance(d, datetime.datetime):
+        d = datetime.datetime(d.year, d.month, d.day)
+    if now and not isinstance(now, datetime.datetime):
+        now = datetime.datetime(now.year, now.month, now.day)
+
+    if not now:
+        if d.tzinfo:
+            now = datetime.datetime.now(d.tzinfo)
+        else:
+            now = datetime.datetime.now()
+
+    # ignore microsecond part of 'd' since we removed it from 'now'
+    delta = now - (d - datetime.timedelta(0, 0, d.microsecond))
+    since = delta.days * 24 * 60 * 60 + delta.seconds
+    if since < 0:
+        # d is in the future compared to now, stop processing.
+        return 'future'
+    if since == 0:
+        return '0 minute' # possbibly a better string here?
+    return timesince_sec(since)