Nodejs 中的日期格式识别，Javascript

Question

I have to find the format of date coming from various data sources. What is the best way to find the format of date considering date , month and year can be in any order .

I need to determine the format by analysing some 10 random records from the table.

function isValidDate(str) {
    var d = moment(str,moment.ISO_8601);             
    if (d == null || !d.isValid()) 
    {
        return false;
    }

    match = ['YYYY-MM-DD','D/M/YYYY','DD/MM/YYYY','D/M/YY','DD/MM/YY','D-M-YYYY','DD-MM-YYYY','D-M-YY','DD-MM-YY','YYYY-MM-DD','YYYY-DD-MM',"MMMM D,YYYY","MMM Do,YYYY"] ;

    for(let i=0;i<12;i++)
    {
        if(str.indexOf(d.format(match[i])) >= 0 ) 
        {
            return match[i];
        }
    }
}

Answer 1

Try in this WAY.. This will help you...

providing date to moment will validate it, no need to pass the date Format.

var date = moment("2016-10-19");

And then

date.isValid() 

gives desired result.