JavaScript regular judgment Date format instance

Example 1

The code is as follows

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/** Determine the date format entered in the input box is YYYY-MM-DD and the correct date */ 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 ("Please ensure that the date format entered in +sm+ is YYYY-MM-DD or the correct date!"); return false; } return true; }

Example 2

The code is as follows

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/** Determine the date format entered in the input box is YYYY/MM/DD and the correct date */ Date format [' Date_au ', function (v) { if (vanadium.validators_types[' empty '].test (v)) return true; var regex =/^ (d{2})/(D{2})/(d{4}) $/; if (!regex.test (v)) return false; var d = new Date (V.replace (Regex, ' $2/$1/$3 ')); Return (parseint (regexp.$2) = = (1 + d.getmonth ()) && (parseint (regexp.$1, 10) = = D.getdate ()) && (parseint (regexp.$3,) = = D.getfullyear ()); },

Example 3

Here we have a more complete date format function

The code is as follows

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Whether it is a date format function Checkdate (strdate) { var reg =/^ (d{4})-(D{2})-(d{2}) $/; if (!reg.test (strdate)) { Alert ("date format is incorrect!/n the correct format is: 2004-01-01"); return false; } var year = strdate.substring (0, 4); var month = strdate.substring (5, 7); var date = strdate.substring (8, 10); if (!checkyear (year)) {return false;} if (!checkmonth (month)) {return false;} if (!checkdate, month, date)) {return false;} return true; } function Checkyear (year) { if (isNaN (parseint (year)) { Alert ("The year entered incorrectly, please re-enter!"); return false; } else if (parseint) < 1950 | | parseint (YEAR) > 2050) { Alert ("Year should be between 1950-2050!"); return false; } else return true; } function Checkmonth (month) { if (parseint (month)) {alert ("The month entered incorrectly, please re-enter!"); else if (parseint (month) < 1 | | | parseint (month, ten) > 12) { Alert ("Month should be between 1-12"); return false; } else return true; } function checkdate (year, month, date) { var daysofmonth = caldays (parseint (year), parseint (month)); if (isNaN (parseint (date)) {alert ("Enter the date incorrectly, please re-enter!"); else if (parseint (date) < 1 | | parseint (DATE) > Daysofmonth) {alert ("date should be between 1-" + Daysofmonth + "); return false; } else return true; } Function caldays (year, month) { var date = new Date (year, month, 0); return Date.getdate (); } function Isleapyear (year) { if (year% 4 = 0 && Year% 100!= 0) | | (Year% 400 = 0)) return true; else return false; }