While developing an application, we often want to display to users how long a particular program takes to execute. Similarly, we would want a time difference set to tell us how long a code snippet took to execute. In this shot, we’ll take a look at a simple time difference code example.
package mainimport ("log""time")func main() {start := time.Now().UnixNano() / int64(time.Millisecond)// do somethingtime.Sleep(1 * time.Second)end := time.Now().UnixNano() / int64(time.Millisecond)diff := end - startlog.Printf("Duration(ms): %d", diff)}
Lines 2–5: We import the necessary packages for the code. The log object is used to display output to the console, and the time object is used to work with time.
Line 7: We use time.Now() to get the current time, and convert it to seconds using dot notation. Next, we attach the UnixNano() to get the milliseconds value and divide it by int64(time.Millisecond).
Line 9: We use time.Sleep(1 * time.Second) to pause the execution time between the code in line 7 and the code in line 10.
Line 10: We do the same thing we did in line 7, but we store the time in the end variable. We delay the execution time in line 9 by 1000 milliseconds. Therefore, we have the end variable a 1000 milliseconds greater than start.
Line 11: Next, we find the difference between the two times by subtracting the end from the start and saving it in the diff variable.
Line 12: We call the log package and use Printf to display our output.