Which OS are you on?
If you're on Windows, this is a known phenomena of that module on that platform. From the HiRes.XS:
/* If the performance counter delta drifts more than 0.5 seconds from
* system time then we recalibrate to the system time. This means we
* move *backwards* in time! */
In your scenario, if when then first timestamp is taken, the clock has drifted by more than half a second, then Time::HiRes 'corrects' its internal counter.
Then, when the second timestamp is taken less that half a second later, the time appears to have run backwards by up to half a second.
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
In the absence of evidence, opinion is indistinguishable from prejudice.
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