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Printable calendars (one whole year on one page)
Monthly calendar graphics
Weekly wall calendars (these have their own domain)
CSS clock demo
Arithmetic quiz for computer or smartphone
Two-player scoreboard "app" -- I also have three-player and four-player versions.
NOTICE: The scoreboard "app" uses a cookie to store your score. No personal information is collected.
Big green digital clock -- it gets the time from the server, but displays it as your local time.
NOTICE: ↑ The clock at this link uses a cookie to keep track of the last time that the page was loaded. No personal information is collected.
A beautiful Japanese calendar which shows your device's date and time.
I also have another version, which shows the date and time in Japan.
This calendar's graphics are from an old Dynax game called Mahjong The Mysterious Orient (麻雀東洋の神秘).
I used information from koyomi8.com to figure out the Japanese lunar calendar date.