js中模仿php strtotime()与date()函数

function datetime_to_unix(datetime){
var tmp_datetime = datetime.replace(/:/g,'-');
tmp_datetime = tmp_datetime.replace(/ /g,'-');
var arr = tmp_datetime.split("-");
var now = new Date(Date.UTC(arr[0],arr[1]-1,arr[2],arr[3]-8,arr[4],arr[5]));
return parseInt(now.getTime()/1000);
}

function unix_to_datetime(unix) {
var now = new Date(parseInt(unix) * 1000);
return now.toLocaleString().replace(/年|月/g, "-").replace(/日/g, " ");
}

var datetime = '2012-11-16 10:36:50';
var unix = datetime_to_unix(datetime);
document.write(datetime+' 转换后的时间戳为: '+unix+'
');

var unix = 1353033300;
var datetime = unix_to_datetime(unix);
document.write(unix+' 转换后的日期为: '+datetime);