…selected for a date range

This commit resolves the following issue
1. Previously we were checking whether to emit the onCalendarClose close or not using the isBefore function but the issue is the startDate has the default time added, but the endDate we get from the calendar component doesn't has any time added to it, hence the isBefore check was failing as the startDate with some time is always ahead of the same date (endDate) without time
2. Similarly we were using the same isBefore function to decide whether to consider the date as startDate or endDate for onChange event handler, as the isBefore will fail because of the few milli-sec difference and the onChange call will fail.  As a result the end date (the currently selected date) is being considered as the startDate, hence we need to once again select the endDate value

Closes: Hacker0x01#4076

Hacker0x01#4394 (review)

Issue No: Hacker0x01#4076

…it's midnight time

Hacker0x01#4394 (review)
Closes: Hacker0x01#4076

… the received dates are invalid

Instead of returning false, throw an exception

…ange-select