Where is the time reading coming from? You’re not going to get a microseconds reading from any of today’s OS/hardware combinations. Milliseconds is likely the highest resolution you’ll be able to achieve and most likely the best accuracy will be something like 20 milliseconds, depending on hardware, OS and JVM.
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While Java 1.5 introduced the nanoTime() method, it can be used to measure elapsed time, not determine current time of day.
I imagine it was a typo but 210 milliseconds is not 000210 microseconds. It is 210000.
What sort of integration are you working on? It seems odd to me that time accuracy to the microsecond is a necessary for a business integration.