diff --git a/hc/front/templatetags/hc_extras.py b/hc/front/templatetags/hc_extras.py
index 16fc643f..23c767b7 100644
--- a/hc/front/templatetags/hc_extras.py
+++ b/hc/front/templatetags/hc_extras.py
@@ -4,6 +4,7 @@ from django import template
 from django.conf import settings
 from django.utils.html import escape
 from django.utils.safestring import mark_safe
+from django.utils.timezone import now
 
 from hc.lib.date import format_duration, format_approx_duration, format_hms
 
@@ -151,3 +152,8 @@ def fix_asterisks(s):
 @register.filter
 def format_headers(headers):
     return "\n".join("%s: %s" % (k, v) for k, v in headers.items())
+
+
+@register.simple_tag
+def now_isoformat():
+    return now().replace(microsecond=0).isoformat()
diff --git a/hc/front/views.py b/hc/front/views.py
index 2c6eedaf..20e21308 100644
--- a/hc/front/views.py
+++ b/hc/front/views.py
@@ -179,7 +179,6 @@ def my_checks(request, code):
         "checks": checks,
         "channels": channels,
         "num_down": num_down,
-        "now": timezone.now(),
         "tags": pairs,
         "ping_endpoint": settings.PING_ENDPOINT,
         "timezones": pytz.all_timezones,
@@ -860,7 +859,6 @@ def add_webhook(request, code):
         "page": "channels",
         "project": project,
         "form": form,
-        "now": timezone.now().replace(microsecond=0).isoformat(),
     }
     return render(request, "integrations/webhook_form.html", ctx)
 
@@ -896,7 +894,6 @@ def edit_webhook(request, code):
         "project": channel.project,
         "channel": channel,
         "form": form,
-        "now": timezone.now().replace(microsecond=0).isoformat(),
     }
     return render(request, "integrations/webhook_form.html", ctx)
 
@@ -921,7 +918,6 @@ def add_shell(request, code):
         "page": "channels",
         "project": project,
         "form": form,
-        "now": timezone.now().replace(microsecond=0).isoformat(),
     }
     return render(request, "integrations/add_shell.html", ctx)
 
diff --git a/templates/integrations/add_shell.html b/templates/integrations/add_shell.html
index 6c4ae7a0..19f8ce06 100644
--- a/templates/integrations/add_shell.html
+++ b/templates/integrations/add_shell.html
@@ -94,7 +94,7 @@
                         <th><code>$NOW</code></th>
                         <td>
                             Current UTC time in ISO8601 format.<br />
-                            Example: "{{ now }}"
+                            Example: "{% now_isoformat %}"
                         </td>
                     </tr>
                     <tr>
diff --git a/templates/integrations/webhook_form.html b/templates/integrations/webhook_form.html
index f2f41278..955c397c 100644
--- a/templates/integrations/webhook_form.html
+++ b/templates/integrations/webhook_form.html
@@ -198,7 +198,7 @@
                         <th><code>$NOW</code></th>
                         <td>
                             Current UTC time in ISO8601 format.<br />
-                            Example: "{{ now }}"
+                            Example: "{% now_isoformat %}"
                         </td>
                     </tr>
                     <tr>