# All files / api timestamp.ts

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     /**
     * Copyright 2017 Google Inc.
     *
     * 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.
     */

    import { Code, FirestoreError } from '../util/error';
    import { primitiveComparator } from '../util/misc';

    export class Timestamp {
      static now(): Timestamp {
        return Timestamp.fromMillis(Date.now());
      }

      static fromDate(date: Date): Timestamp {
        return Timestamp.fromMillis(date.getTime());
      }

      static fromMillis(milliseconds: number): Timestamp {
        const seconds = Math.floor(milliseconds / 1000);
        const nanos = (milliseconds - seconds * 1000) * 1e6;
        return new Timestamp(seconds, nanos);
      }

      constructor(readonly seconds: number, readonly nanoseconds: number) {
        Iif (nanoseconds < 0) {
          throw new FirestoreError(
            Code.INVALID_ARGUMENT,
            'Timestamp nanoseconds out of range: ' + nanoseconds
          );
        }
        Iif (nanoseconds >= 1e9) {
          throw new FirestoreError(
            Code.INVALID_ARGUMENT,
            'Timestamp nanoseconds out of range: ' + nanoseconds
          );
        }
        // Midnight at the beginning of 1/1/1 is the earliest Firestore supports.
        Iif (seconds < -62135596800) {
          throw new FirestoreError(
            Code.INVALID_ARGUMENT,
            'Timestamp seconds out of range: ' + seconds
          );
        }
        // This will break in the year 10,000.
        Iif (seconds >= 253402300800) {
          throw new FirestoreError(
            Code.INVALID_ARGUMENT,
            'Timestamp seconds out of range: ' + seconds
          );
        }
      }

      toDate(): Date {
        return new Date(this.toMillis());
      }

      toMillis(): number {
        return this.seconds * 1000 + this.nanoseconds / 1e6;
      }

      _compareTo(other: Timestamp): number {
        if (this.seconds === other.seconds) {
          return primitiveComparator(this.nanoseconds, other.nanoseconds);
        }
        return primitiveComparator(this.seconds, other.seconds);
      }

      isEqual(other: Timestamp): boolean {
        return (
          other.seconds === this.seconds && other.nanoseconds === this.nanoseconds
        );
      }

      toString(): string {
        return (
          'Timestamp(seconds=' +
          this.seconds +
          ', nanoseconds=' +
          this.nanoseconds +
          ')'
        );
      }
    }