验证ISOString格式？

Question

How to validate if a field is a ISOString format?

It work when I use valid date such as const create = '2018-08-02T02:07:49.214Z' but it break the script when I use const create = 'b';

Example:

 //const create = '2018-08-02T02:07:49.214Z'; const create = 'b'; const dateParsed = new Date(Date.parse(create)) if(dateParsed.toISOString() === create){ console.log(dateParsed.getTime()) } else { console.log('invalid date') } 

I get an error RangeError: Invalid time value but expecting invalid date from console log.

Answer 1

To achieve expected result, add below condition

!isNaN(dateParsed) && dateParsed.toISOString() === create

Issue:

console error is valid , as it throws error with toISOString() of invalid date

working code for reference

 const create = 'b'; const dateParsed = new Date(Date.parse(create)) if(!isNaN(dateParsed) && dateParsed.toISOString() === create){ console.log(dateParsed.getTime()) } else { console.log('invalid date') } 

Answer 2

new Date(Date.parse(create)) will return an Invalid Date, since Date.parse('b') returns NaN . I would point you towards this question: Detecting an "invalid date" Date instance in JavaScript , which provides a couple ways to checking if a date is valid or not.

At least in this example case, it doesn't seem like ISO format is strictly required, but you should be able to construct a regex to at least match the structure (there may be other requirements for a truly valid ISO datestring, I'm not sure off the top of my head).