JS解析,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 '';
}
<script language="javascript">
var myDate=new Date();
document.write(myDate.getYear().toString()+"<br>");//获取当前年份(2位)
document.write(myDate.getFullYear().toString()+"<br>");//获取当前完整的年份(4位,1970-????)
document.write(myDate.getMonth().toString()+"<br>");//获取当前月份(0-11,0代表1月)
document.write(myDate.getDate().toString()+"<br>");//获取当前日(1-31)
document.write(myDate.getDay().toString()+"<br>");//获取当前星期X(0-6,0代表星期天)
document.write(myDate.getTime().toString()+"<br>");//获取当前时间(从1970-1-1开始的毫秒数)
document.write(myDate.getHours().toString()+"<br>");//获取当前小时数(0-23)
document.write(myDate.getMinutes().toString()+"<br>");//获取当前分钟数(0-59)
document.write(myDate.getSeconds().toString()+"<br>");//获取当前秒数(0-59)
document.write(myDate.getMilliseconds().toString()+"<br>");//获取当前毫秒数(0-999)
document.write(myDate.toLocaleDateString().toString()+"<br>");//获取当前日期
</script>
