The control's UI varies in general from browser to browser. The control is intended to represent a local date and time, not necessarily the user's local date and time. In other words, the input allows any valid combination of year, month, day, hour, and minute—even if such a combination is invalid in the user's local time zone (such as the one hour within a daylight saving time spring-forward transition gap).
Value
A string representing the value of the date entered into the input. The format of the date and time value used by this input type is described in Local date and time strings.
You can set a default value for the input by including a date and time inside the value attribute, like so: