从日期中获取日期名称，格式为 dd-mm-yyyy？

Question

I need a way of getting the name of the day eg Monday, Tuesday from a date with the format of DD-MM-YYYY I am using bootstrap datetimepicker and when i select a date, the value is just in the format DD-MM-YYYY, I can't use getDay() because the format doesn't agree with it.

I also can't use new Date() because i has to be a date selected from a calendar. Not todays date. When I run the following code I get the error:

date.getDay() is not a function.

$('#datepicker').datetimepicker().on('dp.change', function (event) {
        let date = $(this).val();
        let day = date.getDay();
        console.log(day);
      });
```

Anyone any ideas?

Answer 1

Parsing string as-is by Date constructor is strongly discouraged , so I would rather recommend to convert your date string into Date the following way:

 const dateStr = '15-09-2020', getWeekday = s => { const [dd, mm, yyyy] = s.split('-'), date = new Date(yyyy, mm-1, dd) return date.toLocaleDateString('en-US', {weekday: 'long'}) } console.log(getWeekday(dateStr))

Answer 2

 function get_day(date){ let d=new Date(date); let days = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday']; let day_index=d.getDay(); return days[day_index] } let today=new Date(); console.log("today is",get_day(today))