The Datepicker calendar container is empty, no dates are displayed

[jas1337]

Hello, at first I have to say that we have been using your datepicker for a while and we appreciate the tool very much.

Description

Recently we found one special case where no dates are displayed in the datepicker container.
Having min/max date set in datepicker element where max is one day after min, date range is equal exactly 864e5 ms.

In this case code this.value = toFormattedDateString(new Date(newValue)); is never reached.
Additionally if datepicker value is not valid value (for example it is null) then this.value is set to be today's date by default.

In result we can have this.value from outside min-max range. Then, inside getMultiCalendars helper function we have incorrect value of selectedDate and if (lastDayOfMonthTime < minTime || +firstDayOfMonth > maxTime) { condition is true, because of that no dates are displayed.

Expected outcome

Dates should be displayed in calendar container, honoring min-max range, date from min-max range should be focused.

Actual outcome

Calendar container is empty.

Steps to reproduce

0. Have datepicker where this.value is null, min and max are dates one after another from month other than current month
   (example value: null, today: 2020-10-16, min: 2020-09-02, max: 20202-09-03)

Browsers Affected

• Chrome/ Opera
• Firefox
• Safari 10+
• Safari 9
• Safari 8
• Safari 7
• Edge 12+
• IE 11

Summary

Suggested solution would be to change > to >= in if (getDateRange(minTime, maxTime) > 864e5) {check.