'Invalid value' when setting default value in HTML5 datetime-local input

Question

Can someone explain why when I set the default value of a datetime-local input with seconds other than :00, the browser gives me an error of "Invalid value."?

This may be a bug in Chrome's implementation of datetime-local since this bug does not appear in the latest Firefox and Safari.

Error in Chrome: 30.0.1599.69

Chrome Canary: 32.0.1665.2 canary

This works:

<input type="datetime-local" name="pub_date" value="2013-10-09T15:38:00"> 

But this does not:

<input type="datetime-local" name="pub_date" value="2013-10-09T15:38:15"> 

Link to fiddle.

Per the W3 Spec for the datetime-local input element, the value attribute should contain "A string representing a local date and time."

Example: 1985-04-12T23:20:50.52 1996-12-19T16:39:57 

I tried both of the above examples and they don't work either.

Update: Confirmed Bug & Solution

This behavior is a known bug.

As of today, the quick fix is to add the step attribute like so for non-zero seconds:

<input type="datetime-local"         name="pub_date"         value="2013-10-09T15:38:15"         step="1"> 

Answer 1

This works in Chrome Version 52.0.2743.116 m

<input type="datetime-local" name="pub_date" value="2013-10-09T15:38:15" />