Hi!

I took some time and went over all cases I found and all of them were simply bad data. I suspect that most of them were added using some automatic way which was passing this timestamp in when there was no data. So I cleaned them up or fixed them (in few cases the right value was "unknown" with a range, in some cases it was 1 BCE, but in most cases I just removed the claim because not only that it is false, it simply invalid, it is not even a valid timestamp).

You can see examples in my recent changes [1].

At this point I would ask more about how this got in (why it is not denied at insertion time) and even more interesting: the web UI does not show any warning about those values. For many other cases you get various warnings about possibly invalid data, but not here. So maybe adding a warning that if such a timestamp is a value, a warning should be shown next to it, that would be great. Of course, even better would be to prevent insertion (because in 99% it means somebody is blindly inserting a default zero value).

[1] https://www.wikidata.org/w/index.php?title=Special:Contributions/Mitar&o...

Mitar

On Mon, Jan 10, 2022 at 4:50 PM Lydia Pintscher Lydia.Pintscher@wikimedia.de wrote:

Hey Mitar,

Also here a few examples would help to better understand what's going on.

Cheers Lydia

On Sun, Jan 9, 2022 at 9:52 AM Mitar mmitar@gmail.com wrote:

...

Hi!

I have been processing a recent Wikidata JSON dump. I have noticed that some claims have +0000-00-00T00:00:00Z as the time value. My understanding is that those are invalid values for time, at least according to [1]. I think they can be safely removed, yes?

[1] https://doc.wikimedia.org/Wikibase/master/php/md_docs_topics_json.html

Mitar

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