[http://incrtcl.sourceforge.net/iwidgets/iwidgets/datefield.gif]

Docs can be found at http://incrtcl.sourceforge.net/iwidgets/iwidgets/datefield.html and http://purl.org/tcl/home/man/iwidgets3.0/datefield.n.html
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A functionally equivalent but tcl-only datefield widget is available at [tcl-only datefield].  This [tcl]/[tk] only version is now a part of [tklib].
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[Category Command], a part of [incr Widgets]