templatetags: add parse_datetime, from django.utils.dateparse (#16178)

combo/public/templatetags/combo.py

@@ -21,6 +21,7 @@ import datetime
 from django import template
 from django.template import RequestContext
 from django.template.base import TOKEN_BLOCK, TOKEN_VAR
+from django.utils import dateparse
 
 from combo.public.menu import get_menu_context
 from combo.utils import NothingInCacheException
@@ -117,6 +118,13 @@ def strptime(date_string, date_format):
     except ValueError:
         return None
 
+@register.filter
+def parse_datetime(date_string):
+    try:
+        return dateparse.parse_datetime(date_string)
+    except ValueError:
+        return None
+
 @register.filter
 def shown_because_admin(cell, request):
     if not (request.user and request.user.is_superuser):

tests/test_public_templatetags.py

@@ -12,6 +12,20 @@ def test_strptime():
     assert t.render(Context({'someday': '2015-04-15'})) == '2015'
     assert t.render(Context({'someday': 'foobar'})) == ''
 
+def test_parse_datetime():
+    t = Template('{% load combo %}{{ someday|parse_datetime|date:"Y m d H i s T" }}')
+    expected = '2015 04 15 13 11 12 UTC'
+    assert t.render(Context({'someday': '2015-04-15T13:11:12'})) == expected
+    assert t.render(Context({'someday': '2015-04-15T13:11:12Z'})) == expected
+    assert t.render(Context({'someday': '2015-04-15T13:11:12+00:00'})) == expected
+    assert t.render(Context({'someday': '2015-04-15T13:11:12.12345'})) == expected
+    assert t.render(Context({'someday': '2015-04-15T13:11:12.12345Z'})) == expected
+    assert t.render(Context({'someday': '2015-04-15T13:11:12.12345+00:00'})) == expected
+    assert t.render(Context({'someday': '2015-04-15T13:11'})) == '2015 04 15 13 11 00 UTC'
+    assert t.render(Context({'someday': '2015-04-15T13'})) == ''
+    assert t.render(Context({'someday': 'foobar'})) == ''
+    assert t.render(Context({'someday': ''})) == ''
+
 def test_has_role():
     t = Template('{% load combo %}{{ request.user|has_role:"Role1" }}')