About Chochim
Chochim (초침, Korean for "second hand") is a server time site for people getting ready for moments that open "on the hour": concert ticketing, train ticket booking and course registration.
Bookings open on the ticketing site's server clock, not your phone's. Those two clocks are often hundreds of milliseconds apart. Chochim measures that gap to 1/1000 of a second and shows you what time it is by the server.
What Chochim does
- Server time: shows the server time of major Korean ticketing sites such as Interpark, YES24, Melon Ticket, Ticketlink and Korail, plus any site you enter, to the millisecond. The method is explained in What is server time?
- Opening countdown: enter the opening time and it counts down by the server clock.
- Reaction time game: measure your reaction time in a pixel-art Western duel and see where you rank among animals and jobs.
- Trending searches: shows keywords drawing attention right now, using public data from Google Trends.
- Guides: practical articles on ticketing, holiday train tickets and reaction time, in seven languages for visitors and foreign residents in Korea.
Our principles
- We don't make macros. Chochim only tells you the time; a person does the clicking. Using it together with automation tools is prohibited.
- We don't collect personal information. There are no accounts, and your settings and game records stay in your browser.
- It's free. We cover running costs with the ads shown on the page.
Server times shown are reference information that may be off depending on network conditions and do not guarantee a booking.
Send feedback or partnership inquiries through the contact page.
Who runs Chochim
Chochim is built and operated by South Central Aerodynamics Research. We design the site, write the measurement code and write the guides ourselves.
Our measurement method is public
How Chochim measures server time, and when the error gets larger, is documented against the actual code in How Chochim measures server time. If the method changes, that article changes with it.
How we write guides
- Official sources first: we check announcements from ticket sellers, organizers, governments and brands first, and use news reports only when no official source exists. Every article lists its sources.
- No guessing: opening times, prices or ticket limits that have not been announced are marked as not announced rather than estimated.
- Dated information: articles about schedules state the date they were written and are updated when announcements come out.
- Retiring past events: articles about events that have ended are merged into related guides so outdated information does not linger.
Reporting errors
If you spot a mistake in an article or a measurement, tell us on the contact page (contact@chochim.com). Confirmed errors are fixed, and significant corrections are noted with a date at the top of the article.
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- BOTHWhy does Korea share Japan's clock? The reason Seoul's true noon is around 12:30Korea sits near 127°E but its clocks follow 135°E. Four changes to standard time and Seoul's true noon.