Asymmetrik/mean2-starter

import * as _ from 'lodash';
import * as moment from 'moment';
import { Moment } from 'moment';

export class UtcDateUtils {

    private static defaultFormat: string = 'YYYY-MM-DD HH:mm:ss[Z]';

    static toTimestamp(value: string | number): number {
        if (null != value) {
            // If it's a number, assume it's a timestamp
            if (_.isNumber(value)) {
                return value;
            }
            // If it's a date, return the ts
            else if (_.isDate(value)) {
                return value.getTime();
            }
            // Now, it's either a date string or a number string
            else {
                let d = new Date(value);
                if (_.isNaN(d.getTime())) {
                    return +value;
                }
                else {
                    return d.getTime();
                }
            }
        }

        return null;
    }

    static format(value: string | number | Moment, format?: string): string {
        if (null != value) {
            let momentDate;
            if (moment.isMoment(value)) {
                momentDate = value;
            }
            else {
                const timestamp = UtcDateUtils.toTimestamp(value);
                momentDate = moment(timestamp).utc();
            }

            if (momentDate.isValid()) {
                return momentDate.format((null != format) ? format : UtcDateUtils.defaultFormat);
            }
        }

        return '-';
    }
}