formatDate

formatDate.js

/**
 * format date.
 * @param {Date/Number} obj date to format, support Date or timestamp
 * @example 
 *   formatDate(new Date(),"yyyy-MM-dd hh:mm:ss")
 *   formatDate(new Date().setHours(0,0,0,0),"yyyy-MM-dd hh:mm:ss")
 */
function formatDate(obj,format){
  var date = obj;
  if(toString.call(obj) !== '[object Date]'){
    date = new Date();
    date.setTime(obj);
  }
  format = format || "yyyy-MM-dd hh:mm:ss";

  var o = { 
    "M+" : date.getMonth()+1, //month 
    "d+" : date.getDate(),    //day 
    "h+" : date.getHours(),   //hour 
    "m+" : date.getMinutes(), //minute 
    "s+" : date.getSeconds(), //second 
    "q+" : Math.floor((date.getMonth()+3)/3),  //quarter 
    "S" : date.getMilliseconds() //millisecond 
  } 
  if(/(y+)/.test(format)){
    format=format.replace(RegExp.$1, (date.getFullYear()+"").substr(4 - RegExp.$1.length));
  }
  for(var k in o){
    if(new RegExp("("+ k +")").test(format)){
      format = format.replace(RegExp.$1, RegExp.$1.length==1 ? o[k] : ("00"+ o[k]).substr((""+ o[k]).length)); 
    }
  }
  return format; 
}