JS判断日期格式是否合法

//函数名：CheckDateTime //功能介绍：检查是否为日期时间 function CheckDateTime(str){ var reg = /^(\d+)-(\d{1,2})-(\d{1,2}) (\d{1,2}):(\d{1,2}):(\d{1,2})$/; var r = str.match(reg); if(r==null)return false; r[2]=r[2]-1; var d= new Date(r[1], r[2],r[3], r[4],r[5], r[6]); if(d.getFullYear()!=r[1])return false; if(d.getMonth()!=r[2])return false; if(d.getDate()!=r[3])return false; if(d.getHours()!=r[4])return false; if(d.getMinutes()!=r[5])return false; if(d.getSeconds()!=r[6])return false; return true; }/** 判断输入框中输入的日期格式为yyyy-mm-dd和正确的日期 */ function IsDate(sm,mystring) { var reg = /^(\d{4})-(\d{2})-(\d{2})$/; var str = mystring; var arr = reg.exec(str); if (str=="") return true; if (!reg.test(str)&&RegExp.$2<=12&&RegExp.$3<=31){ alert("请保证"+sm+"中输入的日期格式为yyyy-mm-dd或正确的日期!"); return false; } return true; }function toDateFromString( strDate ) { if (strDate.length != 8) { return null ; } var dtDate = null ; var nYear = parseInt( strDate.substring( 0, 4 ), 10 ) ; var nMonth = parseInt( strDate.substring( 4, 6 ), 10 ) ; var nDay = parseInt( strDate.substring( 6, 8 ), 10 ) ; if( isNaN( nYear ) == true || isNaN( nMonth ) == true || isNaN( nDay ) == true ) { return null ; } dtDate = new Date( nYear, nMonth - 1, nDay ) ; if( nYear != dtDate.getFullYear() || ( nMonth - 1 ) != dtDate.getMonth() || nDay != dtDate.getDate() ) { return null ; } return dtDate ; } YYYYMMDD的格式