diff --git a/django/conf/locale/cs/LC_MESSAGES/django.mo b/django/conf/locale/cs/LC_MESSAGES/django.mo
index 121d7d4a2b..addcb5054d 100644
Binary files a/django/conf/locale/cs/LC_MESSAGES/django.mo and b/django/conf/locale/cs/LC_MESSAGES/django.mo differ
diff --git a/django/conf/locale/cs/LC_MESSAGES/django.po b/django/conf/locale/cs/LC_MESSAGES/django.po
index 33c32e194b..bf2afb981f 100644
--- a/django/conf/locale/cs/LC_MESSAGES/django.po
+++ b/django/conf/locale/cs/LC_MESSAGES/django.po
@@ -13,7 +13,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: django\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2021-01-15 09:00+0100\n"
+"POT-Creation-Date: 2021-04-10 16:05+0200\n"
 "PO-Revision-Date: 2021-03-18 23:20+0000\n"
 "Last-Translator: Vláďa Macek <macek@sandbox.cz>\n"
 "Language-Team: Czech (http://www.transifex.com/django/django/language/cs/)\n"
@@ -1143,52 +1143,52 @@ msgid ", "
 msgstr ", "
 
 #, python-format
-msgid "%d year"
-msgid_plural "%d years"
-msgstr[0] "%d rok"
-msgstr[1] "%d roky"
-msgstr[2] "%d roku"
-msgstr[3] "%d let"
+msgid "%(num)d year"
+msgid_plural "%(num)d years"
+msgstr[0] "%(num)d rok"
+msgstr[1] "%(num)d roky"
+msgstr[2] "%(num)d roku"
+msgstr[3] "%(num)d let"
 
 #, python-format
-msgid "%d month"
-msgid_plural "%d months"
-msgstr[0] "%d měsíc"
-msgstr[1] "%d měsíce"
-msgstr[2] "%d měsíců"
-msgstr[3] "%d měsíců"
+msgid "%(num)d month"
+msgid_plural "%(num)d months"
+msgstr[0] "%(num)d měsíc"
+msgstr[1] "%(num)d měsíce"
+msgstr[2] "%(num)d měsíců"
+msgstr[3] "%(num)d měsíců"
 
 #, python-format
-msgid "%d week"
-msgid_plural "%d weeks"
-msgstr[0] "%d týden"
-msgstr[1] "%d týdny"
-msgstr[2] "%d týdne"
-msgstr[3] "%d týdnů"
+msgid "%(num)d week"
+msgid_plural "%(num)d weeks"
+msgstr[0] "%(num)d týden"
+msgstr[1] "%(num)d týdny"
+msgstr[2] "%(num)d týdne"
+msgstr[3] "%(num)d týdnů"
 
 #, python-format
-msgid "%d day"
-msgid_plural "%d days"
-msgstr[0] "%d den"
-msgstr[1] "%d dny"
-msgstr[2] "%d dní"
-msgstr[3] "%d dní"
+msgid "%(num)d day"
+msgid_plural "%(num)d days"
+msgstr[0] "%(num)d den"
+msgstr[1] "%(num)d dny"
+msgstr[2] "%(num)d dní"
+msgstr[3] "%(num)d dní"
 
 #, python-format
-msgid "%d hour"
-msgid_plural "%d hours"
-msgstr[0] "%d hodina"
-msgstr[1] "%d hodiny"
-msgstr[2] "%d hodiny"
-msgstr[3] "%d hodin"
+msgid "%(num)d hour"
+msgid_plural "%(num)d hours"
+msgstr[0] "%(num)d hodina"
+msgstr[1] "%(num)d hodiny"
+msgstr[2] "%(num)d hodiny"
+msgstr[3] "%(num)d hodin"
 
 #, python-format
-msgid "%d minute"
-msgid_plural "%d minutes"
-msgstr[0] "%d minuta"
-msgstr[1] "%d minuty"
-msgstr[2] "%d minut"
-msgstr[3] "%d minut"
+msgid "%(num)d minute"
+msgid_plural "%(num)d minutes"
+msgstr[0] "%(num)d minuta"
+msgstr[1] "%(num)d minuty"
+msgstr[2] "%(num)d minut"
+msgstr[3] "%(num)d minut"
 
 msgid "Forbidden"
 msgstr "Nepřístupné (Forbidden)"
diff --git a/django/conf/locale/en/LC_MESSAGES/django.po b/django/conf/locale/en/LC_MESSAGES/django.po
index e3d7690c86..5a96b740c7 100644
--- a/django/conf/locale/en/LC_MESSAGES/django.po
+++ b/django/conf/locale/en/LC_MESSAGES/django.po
@@ -4,7 +4,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Django\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2021-01-15 09:00+0100\n"
+"POT-Creation-Date: 2021-04-10 16:05+0200\n"
 "PO-Revision-Date: 2010-05-13 15:35+0200\n"
 "Last-Translator: Django team\n"
 "Language-Team: English <en@li.org>\n"
@@ -1364,43 +1364,43 @@ msgstr ""
 
 #: utils/timesince.py:9
 #, python-format
-msgid "%d year"
-msgid_plural "%d years"
+msgid "%(num)d year"
+msgid_plural "%(num)d years"
 msgstr[0] ""
 msgstr[1] ""
 
 #: utils/timesince.py:10
 #, python-format
-msgid "%d month"
-msgid_plural "%d months"
+msgid "%(num)d month"
+msgid_plural "%(num)d months"
 msgstr[0] ""
 msgstr[1] ""
 
 #: utils/timesince.py:11
 #, python-format
-msgid "%d week"
-msgid_plural "%d weeks"
+msgid "%(num)d week"
+msgid_plural "%(num)d weeks"
 msgstr[0] ""
 msgstr[1] ""
 
 #: utils/timesince.py:12
 #, python-format
-msgid "%d day"
-msgid_plural "%d days"
+msgid "%(num)d day"
+msgid_plural "%(num)d days"
 msgstr[0] ""
 msgstr[1] ""
 
 #: utils/timesince.py:13
 #, python-format
-msgid "%d hour"
-msgid_plural "%d hours"
+msgid "%(num)d hour"
+msgid_plural "%(num)d hours"
 msgstr[0] ""
 msgstr[1] ""
 
 #: utils/timesince.py:14
 #, python-format
-msgid "%d minute"
-msgid_plural "%d minutes"
+msgid "%(num)d minute"
+msgid_plural "%(num)d minutes"
 msgstr[0] ""
 msgstr[1] ""
 
diff --git a/django/contrib/humanize/locale/cs/LC_MESSAGES/django.mo b/django/contrib/humanize/locale/cs/LC_MESSAGES/django.mo
index 4951d85b71..4b4622290b 100644
Binary files a/django/contrib/humanize/locale/cs/LC_MESSAGES/django.mo and b/django/contrib/humanize/locale/cs/LC_MESSAGES/django.mo differ
diff --git a/django/contrib/humanize/locale/cs/LC_MESSAGES/django.po b/django/contrib/humanize/locale/cs/LC_MESSAGES/django.po
index 679569c0f9..f61b7e5192 100644
--- a/django/contrib/humanize/locale/cs/LC_MESSAGES/django.po
+++ b/django/contrib/humanize/locale/cs/LC_MESSAGES/django.po
@@ -279,110 +279,110 @@ msgstr "za %(delta)s"
 #. Translators: 'naturaltime-past' strings will be included in '%(delta)s ago'
 #, python-format
 msgctxt "naturaltime-past"
-msgid "%d year"
-msgid_plural "%d years"
-msgstr[0] "%d rokem"
-msgstr[1] "%d lety"
-msgstr[2] "%d rokem"
-msgstr[3] "%d lety"
+msgid "%(num)d year"
+msgid_plural "%(num)d years"
+msgstr[0] "%(num)d rokem"
+msgstr[1] "%(num)d lety"
+msgstr[2] "%(num)d rokem"
+msgstr[3] "%(num)d lety"
 
 #, python-format
 msgctxt "naturaltime-past"
-msgid "%d month"
-msgid_plural "%d months"
-msgstr[0] "%d měsícem"
-msgstr[1] "%d měsíci"
-msgstr[2] "%d měsícem"
-msgstr[3] "%d měsíci"
+msgid "%(num)d month"
+msgid_plural "%(num)d months"
+msgstr[0] "%(num)d měsícem"
+msgstr[1] "%(num)d měsíci"
+msgstr[2] "%(num)d měsícem"
+msgstr[3] "%(num)d měsíci"
 
 #, python-format
 msgctxt "naturaltime-past"
-msgid "%d week"
-msgid_plural "%d weeks"
-msgstr[0] "%d týdnem"
-msgstr[1] "%d týdny"
-msgstr[2] "%d týdny"
-msgstr[3] "%d týdny"
+msgid "%(num)d week"
+msgid_plural "%(num)d weeks"
+msgstr[0] "%(num)d týdnem"
+msgstr[1] "%(num)d týdny"
+msgstr[2] "%(num)d týdny"
+msgstr[3] "%(num)d týdny"
 
 #, python-format
 msgctxt "naturaltime-past"
-msgid "%d day"
-msgid_plural "%d days"
-msgstr[0] "%d dnem"
-msgstr[1] "%d dny"
-msgstr[2] "%d dny"
-msgstr[3] "%d dny"
+msgid "%(num)d day"
+msgid_plural "%(num)d days"
+msgstr[0] "%(num)d dnem"
+msgstr[1] "%(num)d dny"
+msgstr[2] "%(num)d dny"
+msgstr[3] "%(num)d dny"
 
 #, python-format
 msgctxt "naturaltime-past"
-msgid "%d hour"
-msgid_plural "%d hours"
-msgstr[0] "%d hodinou"
-msgstr[1] "%d hodinami"
-msgstr[2] "%d hodinami"
-msgstr[3] "%d hodinami"
+msgid "%(num)d hour"
+msgid_plural "%(num)d hours"
+msgstr[0] "%(num)d hodinou"
+msgstr[1] "%(num)d hodinami"
+msgstr[2] "%(num)d hodinami"
+msgstr[3] "%(num)d hodinami"
 
 #, python-format
 msgctxt "naturaltime-past"
-msgid "%d minute"
-msgid_plural "%d minutes"
-msgstr[0] "%d minutou"
-msgstr[1] "%d minutami"
-msgstr[2] "%d minutami"
-msgstr[3] "%d minutami"
+msgid "%(num)d minute"
+msgid_plural "%(num)d minutes"
+msgstr[0] "%(num)d minutou"
+msgstr[1] "%(num)d minutami"
+msgstr[2] "%(num)d minutami"
+msgstr[3] "%(num)d minutami"
 
 #. Translators: 'naturaltime-future' strings will be included in '%(delta)s
 #. from now'
 #, python-format
 msgctxt "naturaltime-future"
-msgid "%d year"
-msgid_plural "%d years"
-msgstr[0] "%d rok"
-msgstr[1] "%d roky"
-msgstr[2] "%d let"
-msgstr[3] "%d let"
+msgid "%(num)d year"
+msgid_plural "%(num)d years"
+msgstr[0] "%(num)d rok"
+msgstr[1] "%(num)d roky"
+msgstr[2] "%(num)d let"
+msgstr[3] "%(num)d let"
 
 #, python-format
 msgctxt "naturaltime-future"
-msgid "%d month"
-msgid_plural "%d months"
-msgstr[0] "%d měsíc"
-msgstr[1] "%d měsíce"
-msgstr[2] "%d měsíců"
-msgstr[3] "%d měsíců"
+msgid "%(num)d month"
+msgid_plural "%(num)d months"
+msgstr[0] "%(num)d měsíc"
+msgstr[1] "%(num)d měsíce"
+msgstr[2] "%(num)d měsíců"
+msgstr[3] "%(num)d měsíců"
 
 #, python-format
 msgctxt "naturaltime-future"
-msgid "%d week"
-msgid_plural "%d weeks"
-msgstr[0] "%d týden"
-msgstr[1] "%d týdny"
-msgstr[2] "%d týdnů"
-msgstr[3] "%d týdnů"
+msgid "%(num)d week"
+msgid_plural "%(num)d weeks"
+msgstr[0] "%(num)d týden"
+msgstr[1] "%(num)d týdny"
+msgstr[2] "%(num)d týdnů"
+msgstr[3] "%(num)d týdnů"
 
 #, python-format
 msgctxt "naturaltime-future"
-msgid "%d day"
-msgid_plural "%d days"
-msgstr[0] "%d den"
-msgstr[1] "%d dny"
-msgstr[2] "%d dní"
-msgstr[3] "%d dní"
+msgid "%(num)d day"
+msgid_plural "%(num)d days"
+msgstr[0] "%(num)d den"
+msgstr[1] "%(num)d dny"
+msgstr[2] "%(num)d dní"
+msgstr[3] "%(num)d dní"
 
 #, python-format
 msgctxt "naturaltime-future"
-msgid "%d hour"
-msgid_plural "%d hours"
-msgstr[0] "%d hodina"
-msgstr[1] "%d hodiny"
-msgstr[2] "%d hodin"
-msgstr[3] "%d hodin"
+msgid "%(num)d hour"
+msgid_plural "%(num)d hours"
+msgstr[0] "%(num)d hodina"
+msgstr[1] "%(num)d hodiny"
+msgstr[2] "%(num)d hodin"
+msgstr[3] "%(num)d hodin"
 
 #, python-format
 msgctxt "naturaltime-future"
-msgid "%d minute"
-msgid_plural "%d minutes"
-msgstr[0] "%d minuta"
-msgstr[1] "%d minuty"
-msgstr[2] "%d minut"
-msgstr[3] "%d minut"
+msgid "%(num)d minute"
+msgid_plural "%(num)d minutes"
+msgstr[0] "%(num)d minuta"
+msgstr[1] "%(num)d minuty"
+msgstr[2] "%(num)d minut"
+msgstr[3] "%(num)d minut"
diff --git a/django/contrib/humanize/locale/en/LC_MESSAGES/django.po b/django/contrib/humanize/locale/en/LC_MESSAGES/django.po
index 88f8982ecc..cf9ec2fcb7 100644
--- a/django/contrib/humanize/locale/en/LC_MESSAGES/django.po
+++ b/django/contrib/humanize/locale/en/LC_MESSAGES/django.po
@@ -4,7 +4,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Django\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2021-01-15 09:00+0100\n"
+"POT-Creation-Date: 2021-04-07 14:40+0200\n"
 "PO-Revision-Date: 2010-05-13 15:35+0200\n"
 "Last-Translator: Django team\n"
 "Language-Team: English <en@li.org>\n"
@@ -283,48 +283,48 @@ msgstr ""
 #: contrib/humanize/templatetags/humanize.py:205
 #, python-format
 msgctxt "naturaltime-past"
-msgid "%d year"
-msgid_plural "%d years"
+msgid "%(num)d year"
+msgid_plural "%(num)d years"
 msgstr[0] ""
 msgstr[1] ""
 
 #: contrib/humanize/templatetags/humanize.py:206
 #, python-format
 msgctxt "naturaltime-past"
-msgid "%d month"
-msgid_plural "%d months"
+msgid "%(num)d month"
+msgid_plural "%(num)d months"
 msgstr[0] ""
 msgstr[1] ""
 
 #: contrib/humanize/templatetags/humanize.py:207
 #, python-format
 msgctxt "naturaltime-past"
-msgid "%d week"
-msgid_plural "%d weeks"
+msgid "%(num)d week"
+msgid_plural "%(num)d weeks"
 msgstr[0] ""
 msgstr[1] ""
 
 #: contrib/humanize/templatetags/humanize.py:208
 #, python-format
 msgctxt "naturaltime-past"
-msgid "%d day"
-msgid_plural "%d days"
+msgid "%(num)d day"
+msgid_plural "%(num)d days"
 msgstr[0] ""
 msgstr[1] ""
 
 #: contrib/humanize/templatetags/humanize.py:209
 #, python-format
 msgctxt "naturaltime-past"
-msgid "%d hour"
-msgid_plural "%d hours"
+msgid "%(num)d hour"
+msgid_plural "%(num)d hours"
 msgstr[0] ""
 msgstr[1] ""
 
 #: contrib/humanize/templatetags/humanize.py:210
 #, python-format
 msgctxt "naturaltime-past"
-msgid "%d minute"
-msgid_plural "%d minutes"
+msgid "%(num)d minute"
+msgid_plural "%(num)d minutes"
 msgstr[0] ""
 msgstr[1] ""
 
@@ -332,47 +332,47 @@ msgstr[1] ""
 #: contrib/humanize/templatetags/humanize.py:214
 #, python-format
 msgctxt "naturaltime-future"
-msgid "%d year"
-msgid_plural "%d years"
+msgid "%(num)d year"
+msgid_plural "%(num)d years"
 msgstr[0] ""
 msgstr[1] ""
 
 #: contrib/humanize/templatetags/humanize.py:215
 #, python-format
 msgctxt "naturaltime-future"
-msgid "%d month"
-msgid_plural "%d months"
+msgid "%(num)d month"
+msgid_plural "%(num)d months"
 msgstr[0] ""
 msgstr[1] ""
 
 #: contrib/humanize/templatetags/humanize.py:216
 #, python-format
 msgctxt "naturaltime-future"
-msgid "%d week"
-msgid_plural "%d weeks"
+msgid "%(num)d week"
+msgid_plural "%(num)d weeks"
 msgstr[0] ""
 msgstr[1] ""
 
 #: contrib/humanize/templatetags/humanize.py:217
 #, python-format
 msgctxt "naturaltime-future"
-msgid "%d day"
-msgid_plural "%d days"
+msgid "%(num)d day"
+msgid_plural "%(num)d days"
 msgstr[0] ""
 msgstr[1] ""
 
 #: contrib/humanize/templatetags/humanize.py:218
 #, python-format
 msgctxt "naturaltime-future"
-msgid "%d hour"
-msgid_plural "%d hours"
+msgid "%(num)d hour"
+msgid_plural "%(num)d hours"
 msgstr[0] ""
 msgstr[1] ""
 
 #: contrib/humanize/templatetags/humanize.py:219
 #, python-format
 msgctxt "naturaltime-future"
-msgid "%d minute"
-msgid_plural "%d minutes"
+msgid "%(num)d minute"
+msgid_plural "%(num)d minutes"
 msgstr[0] ""
 msgstr[1] ""
diff --git a/django/contrib/humanize/templatetags/humanize.py b/django/contrib/humanize/templatetags/humanize.py
index 753a0d9fe1..095a053fa1 100644
--- a/django/contrib/humanize/templatetags/humanize.py
+++ b/django/contrib/humanize/templatetags/humanize.py
@@ -202,21 +202,21 @@ class NaturalTimeFormatter:
     }
     past_substrings = {
         # Translators: 'naturaltime-past' strings will be included in '%(delta)s ago'
-        'year': npgettext_lazy('naturaltime-past', '%d year', '%d years'),
-        'month': npgettext_lazy('naturaltime-past', '%d month', '%d months'),
-        'week': npgettext_lazy('naturaltime-past', '%d week', '%d weeks'),
-        'day': npgettext_lazy('naturaltime-past', '%d day', '%d days'),
-        'hour': npgettext_lazy('naturaltime-past', '%d hour', '%d hours'),
-        'minute': npgettext_lazy('naturaltime-past', '%d minute', '%d minutes'),
+        'year': npgettext_lazy('naturaltime-past', '%(num)d year', '%(num)d years', 'num'),
+        'month': npgettext_lazy('naturaltime-past', '%(num)d month', '%(num)d months', 'num'),
+        'week': npgettext_lazy('naturaltime-past', '%(num)d week', '%(num)d weeks', 'num'),
+        'day': npgettext_lazy('naturaltime-past', '%(num)d day', '%(num)d days', 'num'),
+        'hour': npgettext_lazy('naturaltime-past', '%(num)d hour', '%(num)d hours', 'num'),
+        'minute': npgettext_lazy('naturaltime-past', '%(num)d minute', '%(num)d minutes', 'num'),
     }
     future_substrings = {
         # Translators: 'naturaltime-future' strings will be included in '%(delta)s from now'
-        'year': npgettext_lazy('naturaltime-future', '%d year', '%d years'),
-        'month': npgettext_lazy('naturaltime-future', '%d month', '%d months'),
-        'week': npgettext_lazy('naturaltime-future', '%d week', '%d weeks'),
-        'day': npgettext_lazy('naturaltime-future', '%d day', '%d days'),
-        'hour': npgettext_lazy('naturaltime-future', '%d hour', '%d hours'),
-        'minute': npgettext_lazy('naturaltime-future', '%d minute', '%d minutes'),
+        'year': npgettext_lazy('naturaltime-future', '%(num)d year', '%(num)d years', 'num'),
+        'month': npgettext_lazy('naturaltime-future', '%(num)d month', '%(num)d months', 'num'),
+        'week': npgettext_lazy('naturaltime-future', '%(num)d week', '%(num)d weeks', 'num'),
+        'day': npgettext_lazy('naturaltime-future', '%(num)d day', '%(num)d days', 'num'),
+        'hour': npgettext_lazy('naturaltime-future', '%(num)d hour', '%(num)d hours', 'num'),
+        'minute': npgettext_lazy('naturaltime-future', '%(num)d minute', '%(num)d minutes', 'num'),
     }
 
     @classmethod
diff --git a/django/utils/timesince.py b/django/utils/timesince.py
index a9e6b61959..157dcb72c2 100644
--- a/django/utils/timesince.py
+++ b/django/utils/timesince.py
@@ -6,12 +6,12 @@ from django.utils.timezone import is_aware, utc
 from django.utils.translation import gettext, ngettext_lazy
 
 TIME_STRINGS = {
-    'year': ngettext_lazy('%d year', '%d years'),
-    'month': ngettext_lazy('%d month', '%d months'),
-    'week': ngettext_lazy('%d week', '%d weeks'),
-    'day': ngettext_lazy('%d day', '%d days'),
-    'hour': ngettext_lazy('%d hour', '%d hours'),
-    'minute': ngettext_lazy('%d minute', '%d minutes'),
+    'year': ngettext_lazy('%(num)d year', '%(num)d years', 'num'),
+    'month': ngettext_lazy('%(num)d month', '%(num)d months', 'num'),
+    'week': ngettext_lazy('%(num)d week', '%(num)d weeks', 'num'),
+    'day': ngettext_lazy('%(num)d day', '%(num)d days', 'num'),
+    'hour': ngettext_lazy('%(num)d hour', '%(num)d hours', 'num'),
+    'minute': ngettext_lazy('%(num)d minute', '%(num)d minutes', 'num'),
 }
 
 TIMESINCE_CHUNKS = (
@@ -73,13 +73,13 @@ def timesince(d, now=None, reversed=False, time_strings=None, depth=2):
     since = delta.days * 24 * 60 * 60 + delta.seconds
     if since <= 0:
         # d is in the future compared to now, stop processing.
-        return avoid_wrapping(time_strings['minute'] % 0)
+        return avoid_wrapping(time_strings['minute'] % {'num': 0})
     for i, (seconds, name) in enumerate(TIMESINCE_CHUNKS):
         count = since // seconds
         if count != 0:
             break
     else:
-        return avoid_wrapping(time_strings['minute'] % 0)
+        return avoid_wrapping(time_strings['minute'] % {'num': 0})
     result = []
     current_depth = 0
     while i < len(TIMESINCE_CHUNKS) and current_depth < depth:
@@ -87,7 +87,7 @@ def timesince(d, now=None, reversed=False, time_strings=None, depth=2):
         count = since // seconds
         if count == 0:
             break
-        result.append(avoid_wrapping(time_strings[name] % count))
+        result.append(avoid_wrapping(time_strings[name] % {'num': count}))
         since -= seconds * count
         current_depth += 1
         i += 1
diff --git a/tests/utils_tests/test_timesince.py b/tests/utils_tests/test_timesince.py
index d30bf00ae9..d080f1b1c5 100644
--- a/tests/utils_tests/test_timesince.py
+++ b/tests/utils_tests/test_timesince.py
@@ -77,7 +77,12 @@ class TimesinceTests(TestCase):
 
     def test_second_before_equal_first_humanize_time_strings(self):
         time_strings = {
-            'minute': npgettext_lazy('naturaltime-future', '%d minute', '%d minutes'),
+            'minute': npgettext_lazy(
+                'naturaltime-future',
+                '%(num)d minute',
+                '%(num)d minutes',
+                'num',
+            ),
         }
         with translation.override('cs'):
             for now in [self.t, self.t - self.onemicrosecond, self.t - self.oneday]: