How Do I Fix NaN Problem With dmx-date-picker?

I have a date/time picker defined like this:

<input id="i_mt_autosend_time" class="ml-2 b_right2 rc_5 c_right7 fs_80 w_200" name="autosend_time" is="dmx-date-picker" timepicker=""
									minutes-increment="60" dmx-bind:value="message_template.data.message_template.autosend_datetime" format="ddd d MMM h mm a" utc="true">

It allows me to pick a date and time, but when I click [Apply] the values I have selected are not shown and if I try to select the dates again I get a calendar full of NaN:

nan

What am I doing wrong?

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