Nodejs Date Format formatDate(format)

Method Source Code

/** //from   w ww  .  j  a  v a2  s .  c  om
 * simpleDateFormat.js
 *
 * Source: https://gist.github.com/cstipkovic/3983879
 */

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) {
    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. format(strFormat)

   Date.prototype.format = function (strFormat) {
     'use strict';
     var d = new Date(this),
       mon = ['', 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
       month = ['', 'January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
       day = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'],
       weekday = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
       v = {
         's': String(d.getSeconds()),
   ...
   

2. 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"));
   ...
   

3. 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;
   ...
   

4. 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('-');
   

5. formatDate(date)

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

6. 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) {
   ...
   

7. 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;
   ...
   

8. 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;
   };
   ...
   

9. formatMMDD()

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