javascript - Moment.js ignores day of week during parsing validation -


i trying check string being valid date string. can't validate day of week in string representation.

these 2 commands show similar result:

moment("tuesday 19/09/2017", "dddd d/m/yyyy", true).isvalid()  //true moment("tuesday 20/09/2017", "dddd d/m/yyyy", true).isvalid()  //true

how can check it? can't split string in 2 parts, because don't know format.

it appear isvalid checking date part.

if want check whole string, maybe 1 idea parse it, if result same after re-formating it's valid.

eg.

function valid(dt,fmt) {    return moment(dt, fmt).format(fmt) === dt;  }    let fmt = 'dddd d/m/yyyy';  let dates = [    "tuesday 19/9/2017",    "tuesday 20/9/2017"  ];    dates.foreach((dt) => {    console.log(dt + ' ' + valid(dt, fmt));  });
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>


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