无法使用moment.js格式化

Question

I am trying to format a array of dates using moment.js but I get an error stating

dayOfWeek.format is not a function

I am correctly imported

var startOfWeek = moment().startOf('isoWeek');
var endOfWeek = moment().endOf('isoWeek');

var days = [];
var day = startOfWeek;

while (day <= endOfWeek) {
    days.push(day.toDate());
    day = day.clone().add(1, 'd');
}




var week = days.map(function(dayOfWeek, i){
  console.log(dayOfWeek);
  dayOfWeek.format("dddd, DD-MM-YYYY")
});

Answer 1

moment().format() function usage is not correct .

Current is:

dayOfWeek.format("dddd, DD-MM-YYYY")

Change to:

moment(dayOfWeek).format("dddd, DD-MM-YYYY")

Check here for more information: https://momentjs.com/docs/#/parsing/string-formats/

Answer 2

dayOfWeek = moment(dayOfWeek).format("dddd, DD-MM-YYYY");

Answer 3

Your code will fail because dayOfWeek is not moment object.

To check if your variable is moment object use .isMoment :

moment.isMoment(dayOfWeek) .

To fix your problem simply replace

dayOfWeek.format("dddd, DD-MM-YYYY")

with

moment(dayOfWeek).format("dddd, DD-MM-YYYY")

You are also missing return statement inside .map function.

Working example:

 var startOfWeek = moment().startOf('isoWeek'); var endOfWeek = moment().endOf('isoWeek'); var days = []; var day = startOfWeek; while (day <= endOfWeek) { days.push(day.toDate()); day = day.clone().add(1, 'd'); } var week = days.map(function(dayOfWeek, i){ return moment(dayOfWeek).format("dddd, DD-MM-YYYY") }); console.log(week); 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.22.2/moment.min.js"></script> 

Answer 4

Just a tip, You can also do this

 var currentDate = moment(new Date()); // pass your date obj here. console.log(currentDate.format('DD-MM-YY HH:mm:ss')); // later simply do this. 

 <script src="https://unpkg.com/moment@2.22.2/min/moment.min.js"></script>