JavaScript - 使用格式字符串创建日期

Question

In JavaScript would it be possible to create a date using a format string?

Example:

new Date('10/12/2020', 'dd/mm/yyyy');

new Date('12/10/2020', 'mm/dd/yyyy');

new Date('2020/01/20', 'yyyy/mm/dd');

new Date('2020-01-20', 'yyyy-mm-dd');

new Date('2020 01 20', 'yyyy mm dd');

All of those would create a new valid date.

Answer 1

Javascript does not support creating date with string format. You can use any of the following libraries for formatting,

1. moment.js ( https://momentjs.com/ )

2. Luxon( https://moment.github.io/luxon/ )

3. date-fns ( https://date-fns.org/ )

4. Day.js ( https://day.js.org/ )

Example for moment.js:

• moment().format('MMMM Do YYYY, h:mm:ss a');
• moment(Your date).format('MM/DD/YYYY');

Answer 2

Trying to parse a string using the Date constructor shouldn't be done. This can give you unpredictable results in different browser platforms.

The best is to use a popular date library like moment.js .

It is as easy as this.

moment(str, 'YYYY-MM-DD')

Here is the phrasing guide: https://momentjs.com/guides/#/parsing/