How Accurate is Go's Nanosecond Time Precision?

Go's Time Precision: How Accurate Can You Trust It?

Go's time package boasts nanosecond precision, raising the question of how this is achieved and the reliability of such claims. Concerns arise from Python's well-documented time limitations due to platform constraints.

Go's Implementation

time.Now() ultimately relies on the runtime function time·now, which leverages clock_gettime on Linux amd64, providing nanosecond resolution. On Windows, GetSystemTimeAsFileTime is employed, also generating nanoseconds.

Operating System Dependence

Crucially, resolution depends on the operating system. clock_gettime provides nanosecond precision, while gettimeofday offers only milliseconds. In earlier versions of Go, FreeBSD used the latter, leading to millisecond precision in time·now. However, this has been addressed in subsequent versions.

Assessing Accuracy

To ensure accuracy, you can consult the runtime source code and review the manuals of your operating system. This will provide insights into the specific implementation and limitations for your platform.

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