Class DateTimePicker

var dateTimePicker = CardService.newDateTimePicker()
    .setTitle("Enter the date and time.")
    .setFieldName("date_time_field")
    // Set default value as Jan 1, 2018, 3:00 AM UTC. Either a number or string is acceptable.
    .setValueInMsSinceEpoch(1514775600)
    // EDT time is 5 hours behind UTC.
    .setTimeZoneOffsetInMins(-5 * 60)
    .setOnChangeAction(CardService.newAction()
        .setFunctionName("handleDateTimeChange"));