JavaScript subtract two datetimes to seconds [duplicate] - javascript

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I Need to subtract These datetime in js
2018-08-05 20:38:02 // start date
2018-08-17 00:00:00 // end date
So that I can later on create a Countdown which tells me the days Hours minutes and second left between These two Dates.
Currently I am not able to correctly subtract those two datetimes, any ideas?

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