How Precise is Go's `time` Package, and How Does its Implementation Affect Accuracy?

The Precision of Go's Time Package: Delving into Implementation

Go's time package boasts nanosecond precision, raising questions about its accuracy and implementation. Unlike Python, which acknowledges limitations on time precision due to operating system constraints, Go asserts higher accuracy.

Implementation Details

time.Now() relies on runtime functions. In Linux (amd64), it utilizes clock_gettime, which provides nanosecond resolution. Windows employs GetSystemTimeAsFileTime for similar precision.

Operating System Dependence

Precision depends heavily on the underlying operating system. While Go strives for optimal accuracy, some OSes may offer lower resolution (e.g., FreeBSD previously used gettimeofday, which yielded only millisecond accuracy).

Verifying Precision

To confirm precision, inspect the runtime source code and consult the operating system manuals. This ensures accurate assessments and allows you to determine the limitations imposed by the OS.

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