DateFomater.js

// Author: Gerardo Junior <me@gerardo-junior.com
// Date: 10/14/2019, 8:53:55 PM
// URL: https://gist.github.com/gerardo-junior/ba6ab5a121248328005c5e53d00e7bd7

class DateFomater {
    constructor(datetime) {

        if (typeof datetime !== 'string') 
            throw new Error('The class parameter must be a String')

        let datetimeArr = /(\d{2})\:(\d{2})\:(\d{2})\s(\d{2})\/(\d{2})\/(\d{4})/gi.exec(datetime)
        if (!Array.isArray(datetimeArr)) 
            throw new Error('The class parameter must be a date with HH:mm:ss DD/MM/YYYY format')
        
        let datetimeObj = new Date(datetimeArr[6], datetimeArr[5]-1, datetimeArr[4], datetimeArr[1], datetimeArr[2], datetimeArr[3])
        if (datetimeObj.getFullYear() !== parseInt(datetimeArr[6])
            || datetimeObj.getMonth()+1 !== parseInt(datetimeArr[5])
            || datetimeObj.getDay()+1 !== parseInt(datetimeArr[4])
            || datetimeObj.getHours() !== parseInt(datetimeArr[1])
            || datetimeObj.getMinutes() !== parseInt(datetimeArr[2])
            || datetimeObj.getSeconds() !== parseInt(datetimeArr[3]))
            throw new Error('The class parameter must be a valid date')

        this.datetime = datetimeObj;
    }
    
    get_unix() {
        return Math.round(this.datetime.getTime() / 1000)
    }

    get_datetime() {
        return this.datetime.toISOString().replace(/T/, ' ').replace(/\..+/, '') 
    }
}