Nodejs Date Format formatDate(format)

Method Source Code

Date.prototype.formatDate = function (format) {
    var date = this,
        day = date.getDate(),//from ww w .  j  a  v a2s. c o  m
        month = date.getMonth() + 1,
        year = date.getFullYear(),
        hours = date.getHours(),
        minutes = date.getMinutes(),
        seconds = date.getSeconds();

    if (!format) {
        format = "MM/dd/yyyy";
    }

    format = format.replace("MM", month.toString().replace(/^(\d)$/, '0$1'));

    if (format.indexOf("yyyy") > -1) {
        format = format.replace("yyyy", year.toString());
    } else if (format.indexOf("yy") > -1) {
        format = format.replace("yy", year.toString().substr(2, 2));
    }

    format = format.replace("dd", day.toString().replace(/^(\d)$/, '0$1'));

    if (format.indexOf("t") > -1) {
        if (hours > 11) {
            format = format.replace("t", "pm");
        } else {
            format = format.replace("t", "am");
        }
    }

    if (format.indexOf("HH") > -1) {
        format = format.replace("HH", hours.toString().replace(/^(\d)$/, '0$1'));
    }

    if (format.indexOf("hh") > -1) {
        if (hours > 12) {
            hours -= 12;
        }

        if (hours === 0) {
            hours = 12;
        }
        format = format.replace("hh", hours.toString().replace(/^(\d)$/, '0$1'));
    }

    if (format.indexOf("mm") > -1) {
        format = format.replace("mm", minutes.toString().replace(/^(\d)$/, '0$1'));
    }

    if (format.indexOf("ss") > -1) {
        format = format.replace("ss", seconds.toString().replace(/^(\d)$/, '0$1'));
    }

    return format;
};

Related

1. format1()

   Date.prototype.format1 = function() {
       return "" + this.getMonth() + this.getFullYear();
   function f(d) {
       for (var i=0; i<60; i++) {
           assertEq(d.format1(), "91987");
   f(new Date("10/10/1987 1:11:11"));
   ...
   

2. formatAMPM(date)

   function formatAMPM(date) {
     var hours = date.getHours();
     var minutes = date.getMinutes();
     var ampm = hours >= 12 ? 'pm' : 'am';
     hours = hours % 12;
     hours = hours ? hours : 12; 
     minutes = minutes < 10 ? '0'+minutes : minutes;
     var strTime = hours + ':' + minutes + ' ' + ampm;
     return strTime;
   ...
   

3. formatDate(date)

   function formatDate(date) {
     if(date instanceof Date === false) {
       return console.log("err");
     var year = date.getFullYear();
     var month = pad(date.getMonth() + 1);
     var day = pad(date.getDate());
     return [year, month, day].join('-');
   

4. formatDate(date)

   function formatDate(date){
     return date.split('-').reverse().join('/');
   

5. formatDate(format)

   Date.prototype.formatDate = function(format) {
     var date = this,
       day = date.getDate(),
       month = date.getMonth() + 1,
       year = date.getFullYear(),
       hours = date.getHours(),
       minutes = date.getMinutes(),
       seconds = date.getSeconds();
     if (!format) {
   ...
   

6. formatDate(format)

   Date.prototype.formatDate = function(format) {
     var months = new Array("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec");
     var yyyy = this.getFullYear();
     var yy = yyyy.toString().substring(2);
     var m = this.getMonth() + 1;
     var mm = m < 10 ? "0" + m : m;
     var mmm = months[m - 1];
     var d = this.getDate();
     var dd = d < 10 ? "0" + d : d;
   ...
   

7. formatDay(pattern, dayNames = [], monthnames = [])

   Date.prototype.formatDay = function (pattern, dayNames = [], monthnames = []) {
       pattern = pattern.replace(/dddd/g, dayNames[this.getDay()]);
       pattern = pattern.replace(/dd/g, this.getDate().toString().padLeft(2, 0));
       pattern = pattern.replace(/mmm/g, monthnames[this.getMonth()]);
       pattern = pattern.replace(/mm/g, (this.getMonth() + 1).toString().padLeft(2, 0));
       pattern = pattern.replace(/yyyy/g, this.getFullYear().toString());
       pattern = pattern.replace(/yy/g, this.getFullYear().toString().substr(2, 2));
       return pattern;
   };
   ...
   

8. formatMMDD()

   Date.prototype.formatMMDD = function () {
      return this.getMonth() + 1 + '/' + this.getDate();
   };
   

9. formatMMDDYYYY()

   Date.prototype.formatMMDDYYYY = function () {
      return this.getMonth() + 1 + '/' + this.getDate() + '/' + this.getFullYear();
   };