How to convert date into my required format using dayjs module

Question

I am reading a date from a locator through cypress the actual date is 11/04/2023

cy.get("#eff-date").invoke('text').then(()=>{
const edate = dayjs(text.split(':')[1].format('DD-MMM-YYYY'))
})

What it is returning

04-Nov-2023

But it should be 11-Apr-2023

Answer 1

You're attempting to parse a non-ISO 8601 date string. According to the dayjs docs:

For consistent results parsing anything other than ISO 8601 strings, you should use String + Format.

The following should work.

var customParseFormat = require('dayjs/plugin/customParseFormat')
dayjs.extend(customParseFormat)
...
cy.get("#eff-date")
  .invoke('text')
  .then(()=>{
    // Have to pass the custom parsing format, which is MM and not MMM
    const edate = dayjs(text.split(':')[1], 'DD-MM-YYYY');
    // To display, we have to use dayjs.format()
    console.log(edate.format('DD-MMM-YYYY');
})

More information on using the String + Format (and customParseFormat) here