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moment.js returns invalid Date for moment (String, string)

Wants to compare the timestamp. Tried lots of ways but it is throwing an Invalid Date error. The variables startDate /endDate/testDate returns a same timestamp format in 'DD.MM.YYYY HH:MM:ss' i.e. '21.12.2021 08:29:00'

var startDate = cy.get('[data-placeholder="Select time range (from)"]').invoke('val')
var endDate = cy.get('[data-placeholder="Select time range (to)"]').invoke('val')
var testDate  = cy.get('td:nth-child(5)>span').invoke('text')

1. moment(startDate ,'DD.MM.YYYY HH:MM:ss' ).format('DD.MM.YYYY HH:MM:ss')  ///  returns Invalid Date 
2.  moment(startDate ,'DD.MM.YYYY HH:MM:ss' ).format('DD.MM.YYYY HH:MM:ss').valueOf() ///  returns Invalid Date
3. moment(startDate ,'DD.MM.YYYY HH:MM:ss' ).format()  ///  returns Invalid Date 
4. moment(startDate ,'DD.MM.YYYY HH:MM:ss' ) ///  returns Invalid Date 

Also tried using isBetween() function. But for all the conditions it is throwing result as false.

       cy.log( moment(testDate , 'DD.MM.YYYY HH:MM:ss').isBetween(
            (moment(startDate,'DD.MM.YYYY HH:MM:ss')), (moment(endDate,'DD.MM.YYYY HH:MM:ss'))
            ) )

please correct me.



momentjs docs screenshot

MM in HH:MM:ss should be small letters. That is, moment('21.12.2021 08:29:00', 'DD.MM.YYYY HH:mm:ss') should work fine.