javascript一致的日期格式

Question

I have a function that is expecting the startDate and endDate to be in YYYY-mm-dd format as a (String). Because I'm using a couple components/plugins, sometimes the dates are coming in different formats.

If the date comes in as "Wed Jan 01 2020 00:00:00 GMT-0800" format. I want to convert it into YYYY-mm-dd However, if its already in YYYY-mm-dd format, don't touch it.

I tried using something like where I pass in my initial string, but it seems to be messing up my date because of the inconsistent nature of the startDate value.

var d = new Date(startDate);

var datestring = d.getDate()  + "-" + (d.getMonth()+1) + "-" + d.getFullYear() + " " +
d.getHours() + ":" + d.getMinutes();

Answer 1

You can easily achive the data in YYYY-mm-dd format using toISOString and split

 function getDate(date) { return date.match(/^\\d{4}-\\d{2}-\\d{2}$/) ? date : new Date(date).toISOString().split("T")[0]; } console.log(getDate("2020-03-12")); console.log(getDate("Wed Jan 01 2020 00:00:00 GMT-0800")); console.log(getDate("Wed Dec 01 2020 00:00:00 GMT-0800")); console.log(getDate("Wed Mar 29 2020 00:00:00 GMT-0800"));