In the right-handed panel, there are at least 3 date fields: Date (for the published date, it is the date that came with the item's metadata), Date Added (the date the item came to Zotero) and Modified (the date the archive was last handed in that computer).

My problem is with Date Added that is registering a year delay, even with my OS with the right date and time.

Date Added is also an option to sort columns in the collection pane, as the date is wrong the order in the collections is messed up, which is a problem for me because I have to process the documents I put in Zotero based on the order they came.

I made another test today, and the same problem happened: after some time Zotero changed the date to 2018/08/06 08:34:57 (correct day, month, hour and wrong year).

If you're running any plugins (ZotFile or others), you should try with those disabled.

That's very weird. Have you tried restarting your computer?

I restarted the computer and also verified the BIOS date and hour, everything correct, but the problem still happening.

I uninstalled Zotero, also cleaned %AppData%, reinstalled the Beta version (which I had at the beginning) installed the beta connector to firefox, saved a today online journal news and the problem still is happening

Here is the reference Zotero made in the APA style:

Quase 25% da população mundial enfrenta estresse hídrico extremo. (2019, August 6). Retrieved August 6, 2018, from GaúchaZH website: https://gauchazh.clicrbs.com.br/mundo/noticia/2019/08/quase-25-da-populacao-mundial-enfrenta-estresse-hidrico-extremo-cjyzvpray01q401nx7nmqq30e.html

Sure, I saved 3 items from Scopus, here is the debug ID D1941148416.

I also tried, based on this post https://deciphertools.com/blog/2016-04-14-windows-date-time-bugs/ to change the time zone. And I noticed that when I am in other time zones the problem doesn't happen. But when I came back to my original time zone (UTC-03:00) Brasília it starts again.

Also, as a simple test, if you just paste "2019-08-06 14:20:56" into the Accessed field of an item, is it saved as 2019 or 2018?

Could it be a problem related to the time zone mappings from Java Runtime Environment?

Here is the result:

Mon Aug 06 2018 14:20:27 GMT-0300 (Hora oficial do Brasil)
06/08/2018
2018-08-06 17:20:27

OK, another test in that window:

new Date(2019, 7, 6, 17, 20, 27)

OK, how about this?

var isoDate = '2019-08-06T17:20:27Z';
var output = [];
var _re8601 = /^([0-9]{4})(-([0-9]{2})(-([0-9]{2})(T([0-9]{2}):([0-9]{2})(:([0-9]{2})(\.([0-9]+))?)?(Z|(([-+])([0-9]{2}):([0-9]{2})))?)?)?)?$/;
var d = isoDate.match(_re8601);
var offset = 0;
var date = new Date(d[1], 0, 1);
output.push(date.toString());
if (d[3]) { date.setMonth(d[3] - 1); }
output.push(date.toString());
if (d[5]) { date.setDate(d[5]); }
output.push(date.toString());
if (d[7]) { date.setHours(d[7]); }
output.push(date.toString());
if (d[8]) { date.setMinutes(d[8]); }
output.push(date.toString());
if (d[10]) { date.setSeconds(d[10]); }
output.push(date.toString());
if (d[12]) { date.setMilliseconds(Number("0." + d[12]) * 1000); }
output.push(date.toString());
if (d[14]) {
offset = (Number(d[16]) * 60) + Number(d[17]);
offset *= ((d[15] == '-') ? 1 : -1);
}
offset -= date.getTimezoneOffset();
output.push(offset);
output.push(Number(date));
var time = (Number(date) + (offset * 60 * 1000));
output.push(time);
output.push(new Date(time).toString());
output.join('\n');

And this?

var isoDate = '2019-08-06T17:20:27Z';
new Date("2019", 0, 1).toString() + "\n" + new Date(2019, 0, 1).toString() + "\n" + new Date(isoDate).toString();

OK, this should be fixed in the latest Zotero beta, and the fix will be included in Zotero 5.0.74. Thanks for your help.

Hello,
I am having the same issue with my Zotero 5.0.73 (Windows 10). I noticed that all date information is correct except the year (2018 instead of 2019). The weirdest thing happens when I add a citation from Chrome, it initially presents the right year (2019), but a few seconds later, it becomes 2018. I took screenshots if it is of any help.
Do you have any idea when that fix will be available? I often sort my library for some projects using date added, and it makes things a little awkward.

Thank you all for your great support as always!

Just to let you know that I am likely in the same city as mplenz, and having the same problem with dates (1 year delay).
I realized also that upon this morning my database is not updating correctly in the standalone interface, it doesn't load the most recent entries (although everything is correctly updated online). I deleted the zotero.sqlite and resynced 2 or 3 times, and every time the database is repopulated upon a different date. I am not a pro, but I guess that both problems are related.

I was also having the same issue described by mplentz.
It's been a few months as well.

I did not run all the tests that he did, but it seems that we're both from Brazil and using the UTC -03:00 (Brasilia) timezone.

I was using Zotero 5.0.73.

I updated to Zotero 5.0.74, as suggested by dstillman, ran a few tests, and it seems that the bug is fixed.

If someone still notice this issue in the new version, let us know here.