diff --git a/src/components/date-picker/date-range-picker.ts b/src/components/date-picker/date-range-picker.ts
index 677660c3f3..3152615d31 100644
--- a/src/components/date-picker/date-range-picker.ts
+++ b/src/components/date-picker/date-range-picker.ts
@@ -4,7 +4,7 @@ import type { ActionDetail } from "@material/mwc-list";
 import { mdiCalendarToday } from "@mdi/js";
 import "cally";
 import { css, html, LitElement, nothing } from "lit";
-import { customElement, property, state } from "lit/decorators";
+import { customElement, property, queryAll, state } from "lit/decorators";
 import { firstWeekdayIndex } from "../../common/datetime/first_weekday";
 import {
   formatCallyDateRange,
@@ -29,6 +29,7 @@ import "../ha-list-item";
 import "../ha-time-input";
 import type { DateRangePickerRanges } from "./ha-date-range-picker";
 import { datePickerStyles, dateRangePickerStyles } from "./styles";
+import type { HaTimeInput } from "../ha-time-input";
 
 @customElement("date-range-picker")
 export class DateRangePicker extends LitElement {
@@ -69,6 +70,8 @@ export class DateRangePicker extends LitElement {
     to: { hours: 23, minutes: 59 },
   };
 
+  @queryAll("ha-time-input") private _timeInputs?: NodeListOf<HaTimeInput>;
+
   public connectedCallback() {
     super.connectedCallback();
 
@@ -153,6 +156,7 @@ export class DateRangePicker extends LitElement {
                     )}
                     id="from"
                     placeholder-labels
+                    auto-validate
                   ></ha-time-input>
                   <ha-time-input
                     .value=${`${this._timeValue.to.hours}:${this._timeValue.to.minutes}`}
@@ -163,6 +167,7 @@ export class DateRangePicker extends LitElement {
                     )}
                     id="to"
                     placeholder-labels
+                    auto-validate
                   ></ha-time-input>
                 </div>
               `
@@ -200,6 +205,14 @@ export class DateRangePicker extends LitElement {
     let endDate = new Date(`${dates[1]}T23:59:00`);
 
     if (this.timePicker) {
+      const timeInputs = this._timeInputs;
+      if (
+        timeInputs &&
+        ![...timeInputs].every((input) => input.reportValidity())
+      ) {
+        // If we have time inputs, and they don't all report valid, don't save
+        return;
+      }
       startDate.setHours(this._timeValue.from.hours);
       startDate.setMinutes(this._timeValue.from.minutes);
       endDate.setHours(this._timeValue.to.hours);
@@ -281,7 +294,8 @@ export class DateRangePicker extends LitElement {
   private _handleChangeTime(ev: ValueChangedEvent<string>) {
     ev.stopPropagation();
     const time = ev.detail.value;
-    const type = (ev.target as HaBaseTimeInput).id;
+    const target = ev.target as HaBaseTimeInput;
+    const type = target.id;
     if (time) {
       if (!this._timeValue) {
         this._timeValue = {
diff --git a/src/components/ha-base-time-input.ts b/src/components/ha-base-time-input.ts
index e0aeb75142..3ab107c2e4 100644
--- a/src/components/ha-base-time-input.ts
+++ b/src/components/ha-base-time-input.ts
@@ -137,7 +137,7 @@ export class HaBaseTimeInput extends LitElement {
   @property({ attribute: "placeholder-labels", type: Boolean })
   public placeholderLabels = false;
 
-  @queryAll("ha-input") private _inputs?: HaInput[];
+  @queryAll("ha-input") private _inputs?: NodeListOf<HaInput>;
 
   static shadowRootOptions = {
     ...LitElement.shadowRootOptions,
@@ -145,7 +145,9 @@ export class HaBaseTimeInput extends LitElement {
   };
 
   public reportValidity(): boolean {
-    return this._inputs?.every((input) => input.reportValidity()) ?? true;
+    const inputs = this._inputs;
+    if (!inputs) return true;
+    return [...inputs].every((input) => input.reportValidity());
   }
 
   protected render(): TemplateResult {
diff --git a/src/components/ha-time-input.ts b/src/components/ha-time-input.ts
index 79281ccd3a..090a6c2dbb 100644
--- a/src/components/ha-time-input.ts
+++ b/src/components/ha-time-input.ts
@@ -21,6 +21,8 @@ export class HaTimeInput extends LitElement {
 
   @property({ type: Boolean }) public required = false;
 
+  @property({ attribute: "auto-validate", type: Boolean }) autoValidate = false;
+
   @property({ type: Boolean, attribute: "enable-second" })
   public enableSecond = false;
 
@@ -71,6 +73,7 @@ export class HaTimeInput extends LitElement {
         .clearable=${this.clearable && this.value !== undefined}
         .helper=${this.helper}
         .placeholderLabels=${this.placeholderLabels}
+        .autoValidate=${this.autoValidate}
         day-label="dd"
         hour-label="hh"
         min-label="mm"
@@ -86,6 +89,7 @@ export class HaTimeInput extends LitElement {
 
     const useAMPM = useAmPm(this.locale);
     let value: string | undefined;
+    let updateHours = 0;
 
     // An undefined eventValue means the time selector is being cleared,
     // the `value` variable will (intentionally) be left undefined.
@@ -97,6 +101,8 @@ export class HaTimeInput extends LitElement {
     ) {
       let hours = eventValue.hours || 0;
       if (eventValue && useAMPM) {
+        updateHours =
+          hours >= 12 && hours < 24 ? hours - 12 : hours === 0 ? 12 : 0;
         if (eventValue.amPm === "PM" && hours < 12) {
           hours += 12;
         }
@@ -115,6 +121,17 @@ export class HaTimeInput extends LitElement {
       }`;
     }
 
+    if (updateHours) {
+      // If the user entered a 24hr time in a 12hr input, we need to refresh the
+      // input to ensure it resets back to the 12hr equivalent.
+      this.updateComplete.then(() => {
+        const input = this._input;
+        if (input) {
+          input.hours = updateHours;
+        }
+      });
+    }
+
     if (value === this.value) {
       return;
     }