src/app/util/moment/moment.util.ts

/********************************************************************************
 * Copyright (c) 2020 Contributors to the Eclipse Foundation
 *
 * See the NOTICE file(s) distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0
 *
 * SPDX-License-Identifier: EPL-2.0
 ********************************************************************************/

import * as moment from "moment";
import {MomentFormatSpecification, MomentInput} from "moment";

export const momentFormatInternal = "YYYY-MM-DD";

export const momentFormatDisplayNumeric = "DD.MM.YYYY";

export const momentFormatDisplayFullDateAndTime = "DD.MM.YYYY HH:mm:ss";

/**
 * Transforms a time string (or other MomentInputs) to a JS date object.
 * @param input Time string (or other MomentInput) to parse.
 * @param inputFormat Time format for the input.
 * @param defaultDate Default date (if input is no valid date).
 */
export function parseMomentToDate(input: MomentInput, inputFormat: MomentFormatSpecification, defaultDate?: Date): Date {
    try {
        const m = moment(input, inputFormat);
        return m.isValid() ? m.toDate() : defaultDate;
    } catch (e) {
        return defaultDate;
    }
}

/**
 * Parses a time string from one format to another.
 * @param input Time string which is parsed
 * @param inputFormat Time format for the input
 * @param outputFormat Time format for the result
 */
export function parseMomentToString(
    input: MomentInput,
    inputFormat: MomentFormatSpecification,
    outputFormat: string
): string {
    try {
        const m = moment(input, inputFormat);
        return m.isValid() ? m.format(outputFormat) : "";
    } catch (e) {
        return "";
    }
}

/**
 * Returns the time between two time strings in milliseconds.
 */
export function momentDiff(inputA: MomentInput, inputB: MomentInput, inputFormat: MomentFormatSpecification = momentFormatInternal) {
    try {
        const momentA = moment(inputA, inputFormat);
        const momentB = moment(inputB, inputFormat);
        return momentA.diff(momentB);
    } finally {
        // Do nothing...
    }
}