Hackbard23

You are using the Contact Forms 7 Plugin and are angy about the none HTML 5 Support? 
No Problem. With this Plugin u will have the normal Datepicker & Number Spinner from jQuery in your Internet Explorers and other none HTML5 browsers.
If you have Questions or Feature Request, feel free and contact me.

Contact Form 7 IE DatePicker and Number Spinner Fix

Still works on actual WP 4.7.3. but the need to hack the date format in plugin it self makes it bit awkward.

missing set date format

Works like a charm!

Add the jQuery Datepicker and Spinner functionality to your Contact Form 7

Alex Mills

Normally it is not possible to have a page slug (the page’s name in the URL) that is a number. For example this will not work: <code>yoursite.com/about/2/</code>. That URL conflicts with paged content feature where you can posts and pages with multiple pages of content by adding <code></code> within your content.
This plugin allows you to have pages with numbers as slugs by giving up the ability to have paged content pages which isn’t a big deal as most people don’t use paged content pages anyway.
Code contributions and bug reports are welcome via <a href="https://github.com/Viper007Bond/allow-numeric-stubs" rel="nofollow ugc">this plugin’s GitHub repository</a>.

Allow Numeric Slugs

Works with 5.2.2

Allows Pages to have a slug (URL) that is only a number. Sacrifices the paged content ability in Pages to accomplish it.

Contact Form 7 IE DatePicker and Number Spinner Fix vs Allow Numeric Slugs