How to get month ordinal from string in JS?

Question

JavaScript

There is a date "January 1, 1970", there is a variable that always contains the string of the month (trimmed with spaces), you need to get the ordinal number of the month into the month_number variable (in the case of "January" month_number = 1).
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solved the problem like this

Answer 1

var m = {
    "январь": 1,
    "февраль": 2,
    "март": 3,
    "апрель": 4,
    "май": 5,
    "июнь": 6,
    "июль": 7,
    "август": 8,
    "сентябрь": 9,
    "октябрь": 10,
    "ноябрь": 11,
    "декабрь": 12
};

< m["январь"]
> 1

Answer 2

That's how it will be, although it would be better to immediately decide on the months, they will end in "ь" or "я".

/// Быстро и сразу изменить строку на лету
var str="1 января1844";
var newStr= str.replace (/\d+\s+([^ ]+)\s+\d+/, function(str,s1,s2){
     var sN="";
     if(s1[s1.length-1]==='я') 
              sN=s1.substring(0,s1.length-1)+"ь";
     else sN=s1;
    if(sN && m[sN]!="undefined")    return str.replace(s1,m[sN]); 
     else return str;
});
//  Получить номер месяца
var number;
var mouth="1 января 1844" .match(/\d+\s+([^ ]+)\s+\d+/)[1]; 
number=m[mouth];
 if(number==undefined) 
           number=m[mouth.substring(0,mouth.length-1)+"ь"];