You’re right, if you use the HTML5 code
it displays a date picker in Chrome and Firefox, but just the default text box in Safari, as the date picker is not supported there. So, I wouldn’t use it, in the interest of user friendliness and cross-browser/platform compatibility. I would opt for a different method, i.e. choosing a month, day, year from menus instead – which is what UltimateWB does too for the built-in Calendar app.
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