javascript - How to determine if the date is full date and year only in JS -


i have regex code below validate valid date.

function isvaliddate(div) { var reg = /^((0?\d)|(1[012]))\/([012]?\d|30|31)\/\d{1,4}$/; var regs = /^\/\d{1,4}$/; var datefield = $(div).val(); if (datefield == "") {     //alert('invalid inclusive dates.');     return false; } else {     if (reg.test(datefield) == false && regs.test(datefield) == false) {       // alert('invalid inclusive dates.');         return false;     } else {         return true;     }   } }

i testing code can see have 2 condition in if (reg.test(datefield) == false && regs.test(datefield) == false) {. in line testing if date full date(1/1/2017) or (2017) only. if input 2 different dates return false because of condition. how achieve this?.

make day , month optional:

var reg = /^(?:(0?\d|1[012])\/(0?[1-9]|[12]\d|30|31)\/)?\d{1,4}$/; //          ^^^                                       ^^

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