From 35c668744afa16daf70974abff1d15e85b5bb583 Mon Sep 17 00:00:00 2001
From: Jan Layola <49994364+birrejan@users.noreply.github.com>
Date: Mon, 19 Jan 2026 13:28:08 +0100
Subject: [PATCH] Update ha-base-time-input to accept decimal input for seconds
 (#29058)

* Update ha-base-time-input to accept decimal input for seconds

* Add support for decimal values in time formatting ha-base-time-input
---
 src/components/ha-base-time-input.ts              | 7 ++++---
 test/common/datetime/create_duration_data.test.ts | 6 ++++++
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/src/components/ha-base-time-input.ts b/src/components/ha-base-time-input.ts
index 7c12390d92..40546aa13a 100644
--- a/src/components/ha-base-time-input.ts
+++ b/src/components/ha-base-time-input.ts
@@ -208,7 +208,8 @@ export class HaBaseTimeInput extends LitElement {
             ? html`<ha-textfield
                 id="sec"
                 type="number"
-                inputmode="numeric"
+                inputmode="decimal"
+                step="any"
                 .value=${this._formatValue(this.seconds)}
                 .label=${this.secLabel}
                 @change=${this._valueChanged}
@@ -217,7 +218,6 @@ export class HaBaseTimeInput extends LitElement {
                 no-spinner
                 .required=${this.required}
                 .autoValidate=${this.autoValidate}
-                maxlength="2"
                 max="59"
                 min="0"
                 .disabled=${this.disabled}
@@ -311,7 +311,8 @@ export class HaBaseTimeInput extends LitElement {
    * Format time fragments
    */
   private _formatValue(value: number, padding = 2) {
-    return value.toString().padStart(padding, "0");
+    const str = value.toString();
+    return str.includes(".") ? str : str.padStart(padding, "0");
   }
 
   /**
diff --git a/test/common/datetime/create_duration_data.test.ts b/test/common/datetime/create_duration_data.test.ts
index ae6f8a2aa7..e430cf29ca 100644
--- a/test/common/datetime/create_duration_data.test.ts
+++ b/test/common/datetime/create_duration_data.test.ts
@@ -27,6 +27,12 @@ describe("createDurationData", () => {
     expect(createDurationData(3600)).toEqual({ seconds: 3600 });
   });
 
+  it("should parse decimal seconds correctly", () => {
+    expect(createDurationData(0.5)).toEqual({ seconds: 0.5 });
+    expect(createDurationData(0.2)).toEqual({ seconds: 0.2 });
+    expect(createDurationData(1.25)).toEqual({ seconds: 1.25 });
+  });
+
   it("should parse object duration without days correctly", () => {
     expect(createDurationData({ hours: 1, minutes: 30 })).toEqual({
       hours: 1,