time: simplify Duration.String example

The existing example is needlessly complex.
You have to know that t.Sub returns a Duration
and also have to mentally subtract the two times
to understand what duration should be printed.

Rewrite to focus on just the Duration.String operation.

Change-Id: I00765b6019c07a6ff03022625b556c2b9ba87c09
Reviewed-on: https://go-review.googlesource.com/c/go/+/234893
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

diff --git a/src/time/example_test.go b/src/time/example_test.go
index 15811a62d3baf5bb20ee13c28d303455a0f359b5..0f9b87494404e3306e99dc0a0d58ee80c4846ef4 100644 (file)
--- a/src/time/example_test.go
+++ b/src/time/example_test.go
@@ -50,10 +50,11 @@ func ExampleDuration_Round() {
 }
 
 func ExampleDuration_String() {
-       t1 := time.Date(2016, time.August, 15, 0, 0, 0, 0, time.UTC)
-       t2 := time.Date(2017, time.February, 16, 0, 0, 0, 0, time.UTC)
-       fmt.Println(t2.Sub(t1).String())
-       // Output: 4440h0m0s
+       fmt.Println(1*time.Hour + 2*time.Minute + 300*time.Millisecond)
+       fmt.Println(300*time.Millisecond)
+       // Output:
+       // 1h2m0.3s
+       // 300ms
 }
 
 func ExampleDuration_Truncate() {