JS Date Email Address Verification code

Check the two-date sequence
* Return value:
* If one of the dates is null, the checksum passes and returns true
* If the start date is earlier than or equal to the expiration date, the validation passes and returns True
* If the start date is later than the end date, return false reference information: The start date cannot be later than the end date.
*/

function Checkdateearlier (strstart,strend)
{
if (checkisvaliddate (strstart) = = False | | Checkisvaliddate (strend) = = False)
return false;
If one of the inputs is empty, the check is passed
if ((Strstart = "") | | (Strend = ""))
return true;
var arr1 = Strstart.split ("-");
var arr2 = Strend.split ("-");
var date1 = new Date (Arr1[0],parseint (Arr1[1].replace (/^0/, ""),-1,arr1[2]);
var date2 = new Date (Arr2[0],parseint (Arr2[1].replace (/^0/, ""),-1,arr2[2]);
if (arr1[1].length = 1)
ARR1[1] = "0" + arr1[1];
if (arr1[2].length = 1)
ARR1[2] = "0" + arr1[2];
if (arr2[1].length = 1)
ARR2[1] = "0" + arr2[1];
if (arr2[2].length = 1)
arr2[2]= "0" + arr2[2];
var D1 = arr1[0] + arr1[1] + arr1[2];
var D2 = arr2[0] + arr2[1] + arr2[2];
if (parseint (d1,10) > parseint (d2,10))
return false;
Else
return true;
}//

JS Email Address Verification

* Check whether the string is email type
* Return value:
* If NULL, define checksum pass, return True
* If the string is email type, check pass, return True
* If the email is not valid, return FALSE reference message: Email format is not right!
*/

function   checkemail (str)   
{  
//If NULL, pass checksum   
if (str   ==   "")   
return   true;  
if   (str. Charat (0)    ==   "."    | |    Str.charat (0)    ==   "@"    | |    str.indexof (' @ ',   0)    ==   -1  
| |    str.indexof ('. ',   0)    ==   -1   | |    str.lastindexof ("@")    ==   str.length-1   | |    str.lastindexof (".")    ==   str.length-1)   
return   false;  
else   ;
return   true;  
}//