.format is not a function at eval

Asked Apr 22 '20 at 20:39

Active Apr 22 '20 at 22:43

Viewed 456 times

i have the following function that i am trying to create that groups dates together so that i can get a total amount of cost for the group days as follows

function CreateDailyBalanceTable(result) {

  var groupdates = [];

  for (var i = 0; i < result.length; i++) {
    if (groupdates.indexOf(result[i].ResultDateTime.format("dd-MM-yyyy")) < 0) { //it keeps on throwing an error at this line
      groupdates.push(result[i].ResultDateTime.format("dd-MM-yyyy"));
    }
  }
}

this is an example of the result[i].ResultDateTime how it looks

"2015-08-13T11:41:51.147"

but when it reaches this line "if (groupdates.indexOf(result[i].ResultDateTime.format("dd-MM-yyyy")) < 0)" it breaks and says "result[i].ResultDateTime.format is not a function at eval (eval at CreateDailyBalanceTable)"

how do i fix this?

edited Apr 22 '20 at 22:43

RobG

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asked Apr 22 '20 at 20:39

josh

2

"2015-08-13T11:41:51.147" is a String when `.format` is a method of Date object – Cedric Cholley Apr 22 '20 at 20:45
Actually I'm not sure about the last part, I can't find *Date.prototype.format* on MDN – Cedric Cholley Apr 22 '20 at 20:47
1

`toLocaleFormat` – Dave Newton Apr 22 '20 at 20:51
@DaveNewton still returns the same error – josh Apr 22 '20 at 20:55
Still not a date. – Dave Newton Apr 22 '20 at 21:04
1

@CedricCholley—there is no *format* method of ECMAScript Date objects. – RobG Apr 22 '20 at 22:45
Looks similar to `DateInstance.toISOString()` format. – StackSlave Apr 22 '20 at 22:48
@DaveNewton— [*toLocaleFormat*](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toLocaleFormat) is non–standard and not on track to become one. Perhaps you mean [*toLocaleString*](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toLocaleString). – RobG Apr 23 '20 at 03:04
@RobG Oops--yep. – Dave Newton Apr 23 '20 at 03:46
@RobG the toLocaleString brings back the entire string and not just the date – josh Apr 23 '20 at 08:33
1

@josh—[*options parameters*](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toLocaleDateString) can be used to format the string. See [*How to format a JavaScript date*](https://stackoverflow.com/questions/3552461/how-to-format-a-javascript-date?r=SearchResults&s=1|1457.0205). – RobG Apr 23 '20 at 08:43

.format is not a function at eval

0 Answers0