Add TimeSource

/*

 * Copyright 2025 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.android.server.tv.watchdogservice;

import java.time.Instant;

import java.time.ZoneOffset;

import java.time.ZonedDateTime;

import java.time.temporal.ChronoUnit;

/**

 * Provider for the current value of "now" for users of {@code java.time}.

 */

public abstract class TimeSource {

    public static final ZoneOffset ZONE_OFFSET = ZoneOffset.UTC;

    /** Returns the current instant from the time source implementation. */

    public abstract Instant now();

    /** Returns the current date time for the UTC timezone. */

    public ZonedDateTime getCurrentDateTime() {

        return now().atZone(ZONE_OFFSET);

    }

    /** Returns the current date for the UTC timezone without time. */

    public ZonedDateTime getCurrentDate() {

        return now().atZone(ZONE_OFFSET).truncatedTo(ChronoUnit.DAYS);

    }

}