JSFiddle - React, Tailwind, and code Playground

by lukewarm74

JavaScript

testResult = interpretDate("2-4-1992");
//Display the results
$("body").html("Valid date: " + testResult.valid+"<br />mySQL format:"+testResult.mysqlDate+"<br />\"Human\" format: "+testResult.displayDate);

//Actual interpretDate method
function interpretDate(stringDate){
    var mysqlF = "(\\d{4})[-/](\\d{1,2})[-/](\\d{1,2})";
    var dispF = "(\\d{1,2})[-/](\\d{1,2})[-/]((?:\\d{4})|(?:\\d{2}))";
    var dispNoYearF = "(\\d{1,2})[-/](\\d{1,2})";
    var dateFormats = "(^"+mysqlF+"$)|(^"+dispF+"$)|(^"+dispNoYearF+"$)";

    //Let's try to extract the data
    data = stringDate.match(dateFormats);
    var month = -1;
    var day = -1;
    var year = -1;
    
    //Check to see if the verification failed
    if (data == undefined){
        //Invalid date
        return {valid: false, date: null, mysqlDate:null, displayDate: ""};
    }
    
    //Extract the data based on the entry type
    if (data[1] != undefined){//YYYY-MM-DD
        month = parseInt(data[3]);
        day = parseInt(data[4]);
        year = parseInt(data[2]);
    }else if (data[5] != undefined){//MM-DD-YYYY or MM-DD-YY
        month = parseInt(data[6]);
        day = parseInt(data[7]);
        year = parseInt(data[8]);
        if (year < 100){
            var yearString = new String(new Date().getFullYear());
            year = parseInt(yearString.substr(0,2) + year);
        }
    }else if (data[9] != undefined){//MM-DD
        month = parseInt(data[10]);
        day = parseInt(data[11]);
        year = parseInt(new Date().getFullYear());
    }
    
    //If we are here, we have three numbers, let's see if they make a real date
    var extractedDate = new Date(year, month-1, day);
    if (extractedDate.getFullYear() != year || extractedDate.getDate() != day || extractedDate.getMonth() != (month-1)){
        return {valid: false, date: null, mysqlDate:null, displayDate: ""};
    }
    
    //We have a valid date, let's add front zeros
    var monthFixed = month;
    if (monthFixed < 10)...