[SoftTalker]

You know what's bad? A bespoke date picker that behaves differently from how the date picker works on the rest of the apps on the device.

Usability doesn't matter when there's an established behavior. Users get used to how it works, and then differences cause stumbling blocks.

Use the native date pickers.

[carlosjobim]

The native date pickers are of low quality for usability. They have been so unpopular for so long, that you don't have any users who are accustomed to them. Because almost no apps or websites use the native date pickers.

If you're fine with loosing most of your customers because they can't use your website, then go ahead with native date pickers. But I'm not going to ask my customers to scroll on a list of numbers on their iPhone or try to pinpoint a microscopic calendar on their computer to pick a date. User comes first. Developer comes last.