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On my website, users can provide a source to a blog post. This source is dated. I'd like my users to provide either,

  • a day (format is dd/mm/yyyy),
  • a month (format is mm/yyyy),
  • a year (format could be -y[yyyy] for BC years to y[yyy] for AD years).

and I'd like it to be in a single input.

How can I find an intuitive way to indicate the various format I accept to my users?

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    Could you please share a little more context for this? Why would a user select either a day or a month or a year in the same input? – Cristian Negraia Mar 21 '19 at 13:41
  • Let's see a mock with some surrounding context, and a clearer description of your use case and constraints. – Mike M Mar 21 '19 at 14:07
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I would use a masked input with an entry initialized to a year. The field is then shown as valid even if a day or month are not entered. It lets the user know that they are optional.

[__/__/2019]

If they start entering a day the field becomes invalid (reddish background or border or invalid icon) until they enter a month.

It might be even better to revert the order, with YYYY/MM/DD and put the cursor at the month position. They can correct the year (seeing it become invalid until a full year is entered) or continue entering a month and day.

The BC/AD option is tricky and I think putting the year first is a good solution for this too. It is obviously linked to the year and the + suggests a - is possible:

[+2019/__/__]

You need to handle years with less than 4 digits. To enter year -17 I feel it's natural to type -0017. This it not obvious and you might need to accept -17__ too.

Obviously a hint or help button giving more explanation and examples is always welcome.

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