date comparison moment js

I want to compare two dates and my date format is DD-MM-YYYY but I don’t know why my output returns false when I compare my dates.

example 1

const date1 = '30-06-2021';
const date2 = '10-01-2022';
const result = moment(date1) < moment(date2); // return false, should return true

example 2

const date1 = '30-06-2021';
const date2 = '10-01-2022';
const result = moment(date1).isBefore(date2); // return false, should return true

>Solution :

There are two issues there:

1. You’re expecting moment to guess the format of your dates, but it can’t do that reliably. Always provide a format string if your string isn’t in a RFC2822 or ISO-8601 format. moment itself warns you about doing that in the dev version of the library:

   Deprecation warning: value provided is not in a recognized RFC2822 or ISO format. moment construction falls back to js Date(), which is not reliable across all browsers and versions. Non RFC2822/ISO date formats are discouraged. Please refer to http://momentjs.com/guides/#/warnings/js-date/

2. < cannot be used to meaningfully compare objects. If you want to know if a date is before another date, use the isBefore method.

For example:

const date1 = "30-06-2021";
const date2 = "10-01-2022";
const format = "DD-MM-YYYY";
const result = moment(date1, format).isBefore(moment(date2, format));

const date1 = "30-06-2021";
const date2 = "10-01-2022";
const format = "DD-MM-YYYY";
const result = moment(date1, format).isBefore(moment(date2, format));
console.log(result);

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