How Can Go Precisely Measure Time Durations, Even With System Time Changes?

Precisely Measure Time Duration in Go

Background:

Traditional methods of measuring time duration using the time package can be inaccurate due to adjustments to the system time, such as time zone changes or leap seconds. These adjustments can affect the accuracy of time measurements based on time.Now().

Monotonic Clocks:

Go resolves this issue by using monotonic clocks, which are not subject to such adjustments. Starting with Go 1.9, Go provides a monotonic clock for measuring durations. This ensures that elapsed time measurements are consistent and accurate, even if the system time changes.

Example:

start := time.Now()
... operation that takes 20 milliseconds ...
t := time.Now()
elapsed := t.Sub(start)

In this example, the elapsed time will always be approximately 20 milliseconds, regardless of any changes to the wall clock during the operation.

Other Idioms:

Other time operations that use the monotonic clock include:

• time.Since(start)
• time.Until(deadline)
• time.Now().Before(deadline)

These idioms are also robust against wall clock resets.

Note:

Before Go 1.9, using time.Now() for time measurements could lead to inaccuracies. However, with the introduction of monotonic clocks, Go now provides precise and reliable time duration measurements.

The above is the detailed content of How Can Go Precisely Measure Time Durations, Even With System Time Changes?. For more information, please follow other related articles on the PHP Chinese website!