JS判断日期格式是否合法的简单实例

js判断日期格式是否合法的简单实例

//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