Javascript 解析,格式化日期

hongshaorou 2007-04-28

展開全文

js 代碼

/*
將String類型解析為Date類型.
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(‘不正確的格式‘) 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;
}
/*
將Date/String類型,解析為String類型.
傳入String類型,則先解析為Date類型
不正確的Date,返回 ‘‘
如果時間部分為0,則忽略,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 ‘‘;
}