javascript格式化日期

  将String类型解析为Date类型.

  parseDate('2006-1-1') return new Date(2006,0,1)

  parseDate(' 2006-1-1 ') return new Date(2006,0,1)

  parseDate('2006-1-1 15:14:16') return new Date(2006,0,1,15,14,16)

  parseDate(' 2006-1-1 15:14:16 ') return new Date(2006,0,1,15,14,16);

  parseDate('2006-1-1 15:14:16.254') return new Date(2006,0,1,15,14,16,254)

  parseDate(' 2006-1-1 15:14:16.254 ') return new Date(2006,0,1,15,14,16,254)

  parseDate('不正确的格式') retrun null

*/

function parseDate(str){  

if(typeof str == 'string'){  

var results = str.match(/^ *(\d{4})-(\d{1,2})-(\d{1,2}) *$/);  

if(results && results.length>3)  

return new Date(parseInt(results[1]),parseInt(results[2]) -1,parseInt(results[3]));   

    results = str.match(/^ *(\d{4})-(\d{1,2})-(\d{1,2}) +(\d{1,2}):(\d{1,2}):(\d{1,2}) *$/);  

if(results && results.length>6)  

return new Date(parseInt(results[1]),parseInt(results[2]) -1,parseInt(results[3]),parseInt(results[4]),parseInt(results[5]),parseInt(results[6]));   

    results = str.match(/^ *(\d{4})-(\d{1,2})-(\d{1,2}) +(\d{1,2}):(\d{1,2}):(\d{1,2})\.(\d{1,9}) *$/);  

if(results && results.length>7)  

return new Date(parseInt(results[1]),parseInt(results[2]) -1,parseInt(results[3]),parseInt(results[4]),parseInt(results[5]),parseInt(results[6]),parseInt(results[7]));   

  }  

return null;  

}  

/*

  将Date/String类型,解析为String类型.

  传入String类型,则先解析为Date类型

  不正确的Date,返回 ''

  如果时间部分为0,则忽略,只返回日期部分.

*/

function formatDate(v){  

if(typeof v == 'string') v = parseDate(v);  

if(v instanceof Date){  

var y = v.getFullYear();  

var m = v.getMonth() + 1;  

var d = v.getDate();  

var h = v.getHours();  

var i = v.getMinutes();  

var s = v.getSeconds();  

var ms = v.getMilliseconds();     

if(ms>0) return y + '-' + m + '-' + d + ' ' + h + ':' + i + ':' + s + '.' + ms;  

if(h>0 || i>0 || s>0) return y + '-' + m + '-' + d + ' ' + h + ':' + i + ':' + s;  

return y + '-' + m + '-' + d;  

  }  

return '';  

} 

From: http://gwbasic.javaeye.com/blog/36904

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程序代码

<SCRIPT LANGUAGE="JavaScript">
<!--
    Date.prototype.format = function(format)  
{  
   var o = {  
     "M+" : this.getMonth()+1, //month  
     "d+" : this.getDate(),    //day  
     "h+" : this.getHours(),   //hour  
     "m+" : this.getMinutes(), //minute  
     "s+" : this.getSeconds(), //second  
     "q+" : Math.floor((this.getMonth()+3)/3), //quarter  
     "S" : this.getMilliseconds() //millisecond  
   }  
   if(/(y+)/.test(format)) format=format.replace(RegExp.$1,  
     (this.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;  
}
function rain()
{
obj1 = new Date().format("yyyy-MM-dd hh:mm:ss");
obj2 = new Date().format("yyyy-MM-dd");
obj3 = new Date().format("yyyy/MM/dd");
obj4 = new Date().format("MM/dd/yyyy");
alert("obj1="+obj1+ "/n  obj2="+obj2 +  "/n  obj3="  +obj3+  "/n  obj4="  +obj4);
}
//-->
</SCRIPT>

From: http://www.jacken.com.cn/Web-Design/Javascript/2009-03-11/Javascript_Article_28024.html

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