JS - formatting a datetime value

[techgnome]

I'm trying to format the current datetime into the following format: yyyyMMdd_hhmmss as part of a file download process (the file downloaded will get time stamped with the above value in the name).
in the JS I have this:
new Date().toString("yyyyMMdd_hhmmss");
In the results I'm getting this: Fri_Jul_07_2017_113038_GMT-0400_(Eastern_Daylight_Time)

Woaza! That's way more than I asked for! Bleh. Everything I've looked up uses one library or another. I'm working within the confines of an application, so adding another library isn't a viable option as I don't have the chance to include any thing.

-tg

[NeedSomeAnswers]

I think in JS to get what you want you basically have to use all the individual functions e.g. Date. + getFullYear() , getMonth() , getDate(), getHours() , getMinutes() , getSeconds() and concatenate them all together.

also for some unknown reason in JS you have to add 1 to the Month, and you will probably have to format the output of each of those functions to your required number of digits !

[techgnome]

Yeah, in the end, that's what I ended up doing... kind of a pain in the arse, but it got the job done. I just couldn't see the point of pulling in a whole library just for a single line like this.

var currentdate = new Date();
                b = "samplefile_" + currentdate.getFullYear() + 
                                     ((currentdate.getMonth() < 10) ?"0":"") + (currentdate.getMonth()+1) + 
                                     ((currentdate.getDate() < 10) ?"0":"") +  currentdate.getDate() + "_" +
                                     ((currentdate.getHours() < 10) ?"0":"") + currentdate.getHours() + 
                                     ((currentdate.getMinutes() < 10) ?"0":"") + currentdate.getMinutes() + 
                                     ((currentdate.getSeconds() < 10) ?"0":"") + currentdate.getSeconds() + ".txt"

-tg

[NeedSomeAnswers]

Yep you would have thought that something as simple as that would be built in a bit more elegantly and not make you rely on library's to have a nice way to do it.

[dday9]

Sorry to resurrect and older post, but this seems silly to me. I wonder if formatting date/time Strings was an oversight or intentionally left out because this seems like a basic function of a scripting language.

Edit - Also, I tested this that works without having to use so many ternary if statements:

function yyyyMMdd_hhmmss(d) {
    var arrDate = d.toString().split(/ |:/);
    var yyyy = arrDate[3];
    var MM = ((d.getMonth() < 10) ? "0": "") + (d.getMonth()+1);
    var dd = arrDate[2];
    var hh = arrDate[4];
    var mm = arrDate[5];
    var ss = arrDate[6];

    return yyyy + MM + dd + '_' + hh + mm + ss;
}