Darksiders

I need to keep myself away from Japanese on the dark side, such as typically 2ch users, or those who really use its slangs or behave as written there. Generally speaking those who live, speak, and observe only in the Net or video games, i.e. social myopia.
Not want to keep away because of narrowing the world, but should do so.

When they're in tough or bad situation, they tend to say, "Then I will do bad things, to someone or to anyone." or "I will shut myself up in my room (possibly metaphorically)."
When they're criticized by someone, they say, "Do you think I'm such stupid as you say?!" It seems they hate 'stupid'.

For they very much lower moral and morale, then I have to keep them as much extra effort, which is unnecessary and wasteful.
As my declaration for working well on business.

HTML5 input date validation

HTML5 has <input type="date"> and browsers which support it show their own date picker calender.
And what if you input invalid date, e.g. 2016/2/30?
W3C HTML5 spec says

The value sanitization algorithm is as follows: If the value of the element is not a valid date string, then set it to the empty string instead.

So you never get an original invalid date value.

How can you handle it?


You only know if a value is invalid or not with...

1. input.validity.badInput
2. input.validity.valid
3. input.validationMessage

Further details, please see this: http://stackoverflow.com/questions/13278016/get-input-value-from-html5-inputtype-date-in-chrome/24081375#24081375