javascript强大的日期函数代码分享

vardate=function(a,s){
   vard=s?newDate(s):newDate(),f=d.getTime();
   return(""+a).replace(/a|A|d|D|F|g|G|h|H|i|I|j|l|L|m|M|n|s|S|t|T|U|w|y|Y|z|Z/g,function(a){
       switch(a){
               case"a":returnd.getHours()>11?"pm":"am";
               case"A":returnd.getHours()>11?"PM":"AM";
               case"d":return("0"+d.getDate()).slice(-2);
               case"D":return["Sun","Mon","Tue","Wed","Thu","Fri","Sat"][d.getDay()];
               case"F":return["January","February","March","April","May","June","July","August","September","October","November","December"][d.getMonth()];
               case"g":return(s=(d.getHours()||12))>12?s-12:s;
               case"G":returnd.getHours();
               case"h":return("0"+((s=d.getHours()||12)>12?s-12:s)).slice(-2);
               case"H":return("0"+d.getHours()).slice(-2);
               case"i":return("0"+d.getMinutes()).slice(-2);
               case"I":return(function(){d.setDate(1);d.setMonth(0);s=[d.getTimezoneOffset()];d.setMonth(6);s[1]=d.getTimezoneOffset();d.setTime(f);returns[0]==s[1]?0:1;})();
               case"j":returnd.getDate();
               case"l":return["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"][d.getDay()];
               case"L":return(s=d.getFullYear())%4==0&&(s%100!=0||s%400==0)?1:0;
               case"m":return("0"+(d.getMonth()+1)).slice(-2);
               case"M":return["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"][d.getMonth()];
               case"n":returnd.getMonth()+1;
               case"s":return("0"+d.getSeconds()).slice(-2);
               case"S":return["th","st","nd","rd"][(s=d.getDate())<4?s:0];
               case"t":return(function(){d.setDate(32);s=32-d.getDate();d.setTime(f);returns;})();
               case"T":return"UTC";
               case"U":return(""+f).slice(0,-3);
               case"w":returnd.getDay();
               case"y":return(""+d.getFullYear()).slice(-2);
               case"Y":returnd.getFullYear();
               case"z":return(function(){d.setMonth(0);returnd.setTime(f-d.setDate(1))/86400000;})();
               default:return-d.getTimezoneOffset()*60;
           };
   });
};