Setup

src/components/ha-time-picker.ts

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+import type { PropertyValues } from "lit";
+import { html, LitElement, nothing } from "lit";
+import { customElement, property, state } from "lit/decorators";
+import { useAmPm } from "../common/datetime/use_am_pm";
+import { fireEvent } from "../common/dom/fire_event";
+import type { FrontendLocaleData } from "../data/translation";
+import "./ha-base-time-input";
+import "./ha-numeric-arrow-input";
+import "./ha-button";
+
+@customElement("ha-time-picker")
+export class HaTimePicker extends LitElement {
+  @property({ attribute: false }) public locale!: FrontendLocaleData;
+
+  @property() public value?: string;
+
+  @property({ type: Boolean }) public disabled = false;
+
+  @property({ type: Boolean }) public required = false;
+
+  @property({ type: Boolean, attribute: "enable-second" })
+  public enableSecond = false;
+
+  @state() private _hours = 0;
+
+  @state() private _minutes = 0;
+
+  @state() private _seconds = 0;
+
+  @state() private _useAmPm = false;
+
+  protected firstUpdated(changedProperties: PropertyValues) {
+    super.firstUpdated(changedProperties);
+    this._useAmPm = useAmPm(this.locale);
+
+    let hours = NaN;
+    let minutes = NaN;
+    let seconds = NaN;
+    let numberHours = 0;
+    if (this.value) {
+      const parts = this.value?.split(":") || [];
+      minutes = parts[1] ? Number(parts[1]) : 0;
+      seconds = parts[2] ? Number(parts[2]) : 0;
+      hours = parts[0] ? Number(parts[0]) : 0;
+      numberHours = hours;
+      if (
+        numberHours &&
+        this._useAmPm &&
+        numberHours > 12 &&
+        numberHours < 24
+      ) {
+        hours = numberHours - 12;
+      }
+      if (this._useAmPm && numberHours === 0) {
+        hours = 12;
+      }
+    }
+
+    this._hours = hours;
+    this._minutes = minutes;
+    this._seconds = seconds;
+  }
+
+  protected render() {
+    return html`<div class="container">
+      <ha-numeric-arrow-input
+        .disabled=${this.disabled}
+        .required=${this.required}
+        .min=${this._useAmPm ? 1 : 0}
+        .max=${this._useAmPm ? 12 : 23}
+        .step=${1}
+        .value=${this._hours}
+        @value-changed=${this._hoursChanged}
+      ></ha-numeric-arrow-input>
+
+      <ha-numeric-arrow-input
+        .disabled=${this.disabled}
+        .required=${this.required}
+        .min=${0}
+        .max=${59}
+        .step=${1}
+        .value=${this._minutes}
+        @value-changed=${this._minutesChanged}
+      ></ha-numeric-arrow-input>
+
+      ${this.enableSecond
+        ? html`
+            <ha-numeric-arrow-input
+              .disabled=${this.disabled}
+              .required=${this.required}
+              .min=${0}
+              .max=${59}
+              .step=${1}
+              .value=${this._seconds}
+              @value-changed=${this._secondsChanged}
+            ></ha-numeric-arrow-input>
+          `
+        : nothing}
+      ${this._useAmPm
+        ? html`
+            <ha-button @click=${this._toggleAmPm}>
+              ${this._hours > 12 ? "PM" : "AM"}
+            </ha-button>
+          `
+        : nothing}
+    </div>`;
+  }
+
+  protected updated(changedProperties: PropertyValues) {
+    super.updated(changedProperties);
+    if (changedProperties.has("value")) {
+      this._timeUpdated();
+    }
+
+    if (changedProperties.has("_hours")) {
+      this._timeUpdated();
+    }
+
+    if (changedProperties.has("_minutes")) {
+      this._timeUpdated();
+    }
+
+    if (changedProperties.has("_seconds")) {
+      this._timeUpdated();
+    }
+
+    if (changedProperties.has("_useAmPm")) {
+      this._timeUpdated();
+    }
+  }
+
+  private _hoursChanged(ev: CustomEvent<{ value?: number }>) {
+    const value = ev.detail.value;
+    if (value) {
+      if (this._useAmPm) {
+        if (value > 12) {
+          this._hours = value - 12;
+        } else if (value === 0) {
+          this._hours = 12;
+        } else {
+          this._hours = value;
+        }
+      } else {
+        this._hours = value;
+      }
+    }
+  }
+
+  private _minutesChanged(ev: CustomEvent<{ value?: number }>) {
+    const value = ev.detail.value;
+    if (value) {
+      this._minutes = value;
+    }
+  }
+
+  private _secondsChanged(ev: CustomEvent<{ value?: number }>) {
+    const value = ev.detail.value;
+    if (value) {
+      this._seconds = value;
+    }
+  }
+
+  private _toggleAmPm() {
+    this._hours = this._hours > 12 ? this._hours - 12 : this._hours + 12;
+  }
+
+  private _timeUpdated() {
+    const timeParts = [
+      this._hours.toString().padStart(2, "0"),
+      this._minutes.toString().padStart(2, "0"),
+      this._seconds.toString().padStart(2, "0"),
+    ];
+    if (this._useAmPm) {
+      timeParts.push(this._hours > 12 ? "PM" : "AM");
+    }
+
+    const time = timeParts.join(":");
+    if (time === this.value) {
+      return;
+    }
+    this.value = time;
+    fireEvent(this, "change");
+    fireEvent(this, "value-changed", { value: time });
+  }
+}
+
+declare global {
+  interface HTMLElementTagNameMap {
+    "ha-time-picker": HaTimePicker;
+  }
+}