Quote from telozo:
Why do you guys agonize over this? Every tick of data has a time stamp from the exchange, so where does the computer's own clock comes into picture? I can see a problem with low volume stocks at the beginning and end of the trading day, but other than that...
Speaking for myself... Suppose you have disk drive issues, or a network problem... these events can and will disrupt your trading... but disk drive problems don't come with their own timestamps... you have to rely on information in syslog... so if you see data gaps on your charts, you can check the logs to determine whether there is a correlation between the gaps and potential issues with your server.