sWhy is iPhone IOS showing invalid date for momentjs

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I have a datepicker which was returning a moment object that was always in UTC timezone. I needed to do some logic on this date, but always wanted it in the users local timezone so I did the following:

    //strip submission date of timezone offset
    let submission_date = moment(this.state.startDate).format('YYYY-MM-DD hh:mm:ss a');
    submission_date = moment(submission_date);
    let last_date = this.last_date.diff(submission_date, 'days');

However, when I do this my iphone complains that submission_date is not a valid date. Desktop is fine so I'm guessing this is a safari issue. When I inspect this.state.startDate just prior to being momentized it's a string like 2018-11-01T17:52:44-00:00

Shouldn't moment accept that as a valid date?

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I had figured out that it's the 'a' flag in the format string. I changed it to 'YYYY-MM-DDTHH:mm:ss' and it worked perfectly. Safari must not like am/pm data

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