Add template filter timedelta_seconds to create a timedelta from seconds (#39608)

homeassistant/helpers/template.py

@@ -1,7 +1,7 @@
 """Template helper methods for rendering strings with Home Assistant data."""
 import base64
 import collections.abc
-from datetime import datetime
+from datetime import datetime, timedelta
 from functools import wraps
 import json
 import logging
@@ -1102,6 +1102,7 @@ class TemplateEnvironment(ImmutableSandboxedEnvironment):
         self.globals["utcnow"] = dt_util.utcnow
         self.globals["as_timestamp"] = forgiving_as_timestamp
         self.globals["relative_time"] = relative_time
+        self.globals["timedelta"] = timedelta
         self.globals["strptime"] = strptime
         self.globals["urlencode"] = urlencode
         if hass is None:

tests/helpers/test_template.py

@@ -892,6 +892,65 @@ def test_relative_time(mock_is_safe, hass):
         )
 
 
+@patch(
+    "homeassistant.helpers.template.TemplateEnvironment.is_safe_callable",
+    return_value=True,
+)
+def test_timedelta(mock_is_safe, hass):
+    """Test relative_time method."""
+    now = datetime.strptime("2000-01-01 10:00:00 +00:00", "%Y-%m-%d %H:%M:%S %z")
+    with patch("homeassistant.util.dt.now", return_value=now):
+        assert (
+            "0:02:00"
+            == template.Template(
+                "{{timedelta(seconds=120)}}",
+                hass,
+            ).async_render()
+        )
+        assert (
+            "1 day, 0:00:00"
+            == template.Template(
+                "{{timedelta(seconds=86400)}}",
+                hass,
+            ).async_render()
+        )
+        assert (
+            "1 day, 4:00:00"
+            == template.Template(
+                "{{timedelta(days=1, hours=4)}}",
+                hass,
+            ).async_render()
+        )
+        assert (
+            "1 hour"
+            == template.Template(
+                "{{relative_time(now() - timedelta(seconds=3600))}}",
+                hass,
+            ).async_render()
+        )
+        assert (
+            "1 day"
+            == template.Template(
+                "{{relative_time(now() - timedelta(seconds=86400))}}",
+                hass,
+            ).async_render()
+        )
+        assert (
+            "1 day"
+            == template.Template(
+                "{{relative_time(now() - timedelta(seconds=86401))}}",
+                hass,
+            ).async_render()
+        )
+        assert (
+            "15 days"
+            == template.Template(
+                "{{relative_time(now() - timedelta(weeks=2, days=1))}}",
+                hass,
+            ).async_render()
+        )
+
+
 @patch(
     "homeassistant.helpers.template.TemplateEnvironment.is_safe_callable",
     return_value=True,