There is a daily limit of 200 rep for things like upvotes on answers. What constitutes a day though? Is it a rolling 24 hour period? 12:00am to 12:00am GMT? Something similar with my own time zone?
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$\begingroup$ possible duplicate of What is the standard time maintained by MSE? $\endgroup$– Grigory MCommented Dec 28, 2013 at 16:29
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$\begingroup$ @GrigoryM I think this is a different question. Just because the standard time is UTC doesn't tell you if/when a rolling interval is used for limits, if a fixed interval is used that starts at 0:00, or at 6:00, etc. $\endgroup$– 2'5 9'2Commented Dec 28, 2013 at 16:32
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$\begingroup$ Oh, guess you're right, sorry $\endgroup$– Grigory MCommented Dec 28, 2013 at 16:39
2 Answers
Depends on the particular limit.
For reputation and badges, the UTC day is used (0:00-23:59 UTC time). See What is an SE "day"? When does each day start? For other reputation-related rules, see How does "Reputation" work?
Rate-limiting, such as the limit on the number of questions asked, is based on a rolling period. That is, the daily limit for questions is 6 questions in any 24 hour period. See Time reset/ending time for "Sorry, you are only allowed to ask 6 questions in a 24 hour period" For more information in rate-limiting, see The Complete Rate-Limiting Guide. Did you know that you can change your Winterbash hat only once every 10 seconds?
Coordinated Universal Time, in particular the UTZ zone (essentially GMT). (See this previous meta question for finding current UTC time within the new top-bar, or go here.)