date parse uses default 1972, fromISOString uses 1970

[Douglas Hays]

Running dijit/form/test_timetextbox.html, the first textbox displays 5:45pm. Click this value to display the popup and then click outside the box to cancel. You see the onChange fires even though the value is unchanged. This is because the date object returned by the parser's fromISOstring() invocation has a year of 1970, but the date object returned by parse() inside the widget is 1972, and thus the dates differ. Attached is a patch to locale.js to make the default year = 1970 to be consistent with other date implementations. The defaults should also be documented somewhere.

[Douglas Hays]

code patch to locale.js to use 1970

[Adam Peller]

(In [12198]) build the Date object at the end, not as we go along. The setters on Date seem to have a bunch of issues. Calling the Date constructor once is more reliable and probably more performant. Also, use 1970 as the default year. Fixes #5716, #5680