1 files changed, 67 insertions, 0 deletions
diff --git a/webapp/django/utils/timesince.py b/webapp/django/utils/timesince.py
new file mode 100644
index 0000000000..e1132c3ab3
--- /dev/null
+++ b/webapp/django/utils/timesince.py
@@ -0,0 +1,67 @@
+import datetime
+import time
+
+from django.utils.tzinfo import LocalTimezone
+from django.utils.translation import ungettext, ugettext
+
+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
+    """
+    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))
+    )
+    # Convert datetime.date to datetime.datetime for comparison
+    if d.__class__ is not datetime.datetime:
+        d = datetime.datetime(d.year, d.month, d.day)
+    if now:
+        t = now.timetuple()
+    else:
+        t = time.localtime()
+    if d.tzinfo:
+        tz = LocalTimezone(d)
+    else:
+        tz = None
+    now = datetime.datetime(t[0], t[1], t[2], t[3], t[4], t[5], tzinfo=tz)
+
+    # 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 u'0 ' + ugettext('minutes')
+    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 timeuntil(d, now=None):
+    """
+    Like timesince, but returns a string measuring the time until
+    the given time.
+    """
+    if now == None:
+        now = datetime.datetime.now()
+    return timesince(now, d)