Y2K Bug Simulator
The Y2K Bug Simulator adds filters to most core WordPress functions that report back a date, rendering 19xx in place of 20xx.
Consider an alternative
Y2K Bug Simulator shows warning signs in 2026 — compare the alternatives below before installing. Was last updated 8 years ago, and scores 21/100 on our health check.
- Small user base (<10 active installs)
- Very few reviews so far
- No update in 8 years
- Only tested up to WordPress 4.9 (latest is 7.1)
How does it stack up?
Side-by-side on installs, updates, ratings & supportDaily downloads
Download spikes usually follow a new release — each site that auto-updates counts as a download.
Rankings
Where Y2K Bug Simulator stands todayWordPress.org search rankings
Live position in the plugin search, top 100| Keyword | Position |
|---|---|
| bugs | >100 |
| entertainment | #89 |
| millenium | #2 |
| y2k | #3 |
About Y2K Bug Simulator
From the official readme · v1.3Description
The Y2K Bug Simulator partially mimics one of the potential y2k failures that could (and did) affect some systems after December 31, 1999. The specific failure it mimics is one which typically occurred in systems where years were represented using two digits rather than four. Thus, in an affected system, the day after December 31, 1999 might be rendered as January 1, 1900 (in this scenario, only the last two digits of the year roll over, the first two are hard-coded as “19”).
The bug that this plugin mimics was certainly not the only y2k bug, nor, arguably, a terribly significant one. It is, however, perhaps the most aesthetically interesting. The effect of this plugin on WordPress is to change 20xx dates into 19xx dates across page titles, posts, and comments, as well as archives and calendars.
Some things to note:
- By default, on initial activation following install, only admin-level users will see the effects of the plugin. This can be opened to all users, including non-logged ones, through the new Y2K settings page (new in 1.2).
- The date modification occurs immediately after the plugin is installed and activated. It disappears immediately after the plugin is deactivated/uninstalled.
- The change is at the presentation layer only. This means, among other things, that all stored site content and data remain unchanged. Moreover, site navigation is not affected. If you click on a link to a post identified as being from February 14, 1914, it will bring you to the post for February 14, 2014 (but still say 1914).
- Internal date references are not affected. If you create a post/add a comment while the plugin is active, that content will not be stored with the modified date, but with the actual date, and will show that date when the plugin is deactivated/uninstalled.
- Any plugins/templates/other content that do not utilize WordPress core functions for date presentation will not have their dates modified.
Installation
- Upload
jbl-y2k.phpto the/wp-content/plugins/directory - Activate the plugin through the ‘Plugins’ menu in WordPress
Changelog
1.3
- Tested up to WP 4.9.8
1.2
- Tested up to WP 4.1.
- Added plugin settings page.
- Added option to limit visibility of Y2K effect to admin users (default).
- Fixed archive/calendar links for permalink formats other than ‘default’.
1.1
- Tested up to WP 4.0. Added icon.
1.0
- Initial release.
For developers
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Best Y2K Bug Simulator alternatives
All bugs plugins →FAQ
Y2K Bug Simulator: quick answers
Straight answers, pulled from live WordPress.org data.
Live data from WordPress.org · checked Oct 5, 2026
Is Y2K Bug Simulator free?
Yes. Y2K Bug Simulator is free to download and use from the official WordPress.org plugin directory.
Is Y2K Bug Simulator safe to use in 2026?
Y2K Bug Simulator shows warning signs in 2026 — compare the alternatives below before installing. Was last updated 8 years ago, and scores 21/100 on our health check.
How many websites use Y2K Bug Simulator?
Y2K Bug Simulator is active on <10 WordPress websites and has been downloaded 1,254 times since it launched in April 2014. It was downloaded 24 times in the last 30 days.
Does Y2K Bug Simulator work with WordPress 7.1?
Y2K Bug Simulator is officially tested up to WordPress 4.9.33, while the latest release is 7.1.2. It may still work, but try it on a staging site first.
When was Y2K Bug Simulator last updated?
The latest version, 1.3, was released on August 4, 2018 (8 years ago).
Who makes Y2K Bug Simulator?
Y2K Bug Simulator is developed and maintained by James Luberda.
What are the best alternatives to Y2K Bug Simulator?
The most popular alternatives to Y2K Bug Simulator are Hotfix (4K+ installs), WH Tweaks (90+ installs) and Browsee (30+ installs).
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