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The SF limits are said to reset every 24 hours - how do I know when exactly? Is it on some constant time of day for all the orgs, or based on the org time zone?
For example - if I have crossed the callout limit, when will it be reset and I would be able to callout again?
The e-mail limits are calculated based on Greenwich Mean Time - see "Email Limits" in http://www.salesforce.com/us/developer/docs/apexcode/Content/apex_gov_limits.htm
I think other limits are calculated on a 24-hour basis, but I'm not 100% certain. I don't believe limits are ever "reset" to 0. We've watched our API usage at my company, and we noticed them fluctuating throughout the day.
Also from the documentation above: "The maximum number of batch executions is 250,000 per 24 hours." The language used (Per 24 hours) seems to indicate an on-going basis.
I believe it is cumulative over a given 24 hour period rather than being set at specific points in time, i.e. between 00:00 and 23:59. I think it checks the preceding 24 hours to see how many callouts have been made in that time period, and if you've exceeded the limit it will raise an exception.
I was wondering as well and checked with the Salesforce Support team - it's a 24h sliding window.
You can take it quite literally as exactly “the last 24 hours”.
I wrote a short post about this here: https://mbwhatsnew.wordpress.com/2017/07/10/when-does-the-salesforce-api-limit-reset/
