JavaScript code for determining whether the date format is correct

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Copy codeThe Code is as follows:
//---------------------------------------------------------------------------
// Determine whether the date format is correct
// The returned value is an error message, indicating a valid date string without an error message
Function isDateString (strDate ){
Var strSeparator = "-"; // Date Separator
Var strDateArray;
Var intYear;
Var intMonth;
Var intDay;
Var boolLeapYear;
Var ErrorMsg = ""; // error message
StrDateArray = strDate. split (strSeparator );
// The length is not determined. In fact, is also reasonable // strDate. length! = 10 |
If (strDateArray. length! = 3 ){
ErrorMsg + = "the date format must be yyyy-MM-dd ";
Return ErrorMsg;
}
IntYear = parseInt (strDateArray [0], 10 );
IntMonth = parseInt (strDateArray [1], 10 );
IntDay = parseInt (strDateArray [2], 10 );
If (isNaN (intYear) | isNaN (intMonth) | isNaN (intDay )){
ErrorMsg + = "Date Format error: year, month, and day must be pure numbers ";
Return ErrorMsg;
}
If (intMonth> 12 | intMonth <1 ){
ErrorMsg + = "Date Format error: month must be between 1 and 12 ";
Return ErrorMsg;
}
If (intMonth = 1 | intMonth = 3 | intMonth = 5 | intMonth = 7
| IntMonth = 8 | intMonth = 10 | intMonth = 12)
& (IntDay> 31 | intDay <1 )){
ErrorMsg + = "Date Format error: the number of days in a large month must be between 1 and 31 ";
Return ErrorMsg;
}
If (intMonth = 4 | intMonth = 6 | intMonth = 9 | intMonth = 11)
& (IntDay> 30 | intDay <1 )){
ErrorMsg + = "Date Format error: the number of days in a small month must be between 1 and 31 ";
Return ErrorMsg;
}
If (intMonth = 2 ){
If (intDay <1 ){
ErrorMsg + = "Date Format error: date must be greater than or equal to 1 ";
Return ErrorMsg;
}
BoolLeapYear = false;
If (intYear % 100) = 0 ){
If (intYear % 400) = 0)
BoolLeapYear = true;
}
Else {
If (intYear % 4) = 0)
BoolLeapYear = true;
}
If (boolLeapYear ){
If (intDay> 29 ){
ErrorMsg + = "Date Format error: the number of days in March of a leap year cannot exceed 29 ";
Return ErrorMsg;
}
} Else {
If (intDay> 28 ){
ErrorMsg + = "Date Format error: the number of days in February of a non-leap year cannot exceed 28 ";
Return ErrorMsg;
}
}
}
Return ErrorMsg;
}