I have set an alert message on User Input of a Date Field. 

Date Field

Deluge Script

Bug Type 1:

Step 1: I select a date. The alert message is shown.

Step 2: I delete the date and click out of the field, the alert message is shown.

Step 3: I click on the date field and select today's date and click out of the field, alert message doesn't popup.

Bug Type 2:

Follow Step 1 & Step 2.

Step 3: I click on the date field but I don't select any date. But the date field gets auto populated with today's date. Without selecting a date myself, I click out of the field, no alert message despite the change in value (null->today's date)

Can someone confirm if this is the expected behaviour or is it a bug?