time: condense, expand Time.Unix example

The new example is shorter but illustrates the
interesting parts of the Unix function and methods.

Change-Id: Ief8ec38909d4ed7829e8d3da58e7b7f712537f99
Reviewed-on: https://go-review.googlesource.com/82079
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

diff --git a/src/time/example_test.go b/src/time/example_test.go
index 8b2ac07d63ec35191cb24de487f114dbd8150c20..8c64506027ffed1bf7e5dc432aca2ec6f7bd7fa5 100644 (file)
--- a/src/time/example_test.go
+++ b/src/time/example_test.go
@@ -356,23 +356,21 @@ func ExampleParseInLocation() {
 }
 
 func ExampleTime_Unix() {
-       // Create a date.
-       const nsecs = 0
-       orig := time.Date(2009, time.January, 1, 1, 9, 30, nsecs, time.UTC)
-       fmt.Printf("orig = %v\n", orig)
+       // 1 billion seconds of Unix, three ways.
+       fmt.Println(time.Unix(1e9, 0).UTC())     // 1e9 seconds
+       fmt.Println(time.Unix(0, 1e18).UTC())    // 1e18 nanoseconds
+       fmt.Println(time.Unix(2e9, -1e18).UTC()) // 2e9 seconds - 1e18 nanoseconds
 
-       // Get the Unix timestamp of the date.
-       unix := orig.Unix()
-       fmt.Printf("orig.Unix() = %v\n", unix)
-
-       // Convert the Unix date back to a time.Time.
-       parsed := time.Unix(unix, nsecs).UTC()
-       fmt.Printf("parsed = %v\n", parsed)
+       t := time.Date(2001, time.September, 9, 1, 46, 40, 0, time.UTC)
+       fmt.Println(t.Unix())     // seconds since 1970
+       fmt.Println(t.UnixNano()) // nanoseconds since 1970
 
        // Output:
-       // orig = 2009-01-01 01:09:30 +0000 UTC
-       // orig.Unix() = 1230772170
-       // parsed = 2009-01-01 01:09:30 +0000 UTC
+       // 2001-09-09 01:46:40 +0000 UTC
+       // 2001-09-09 01:46:40 +0000 UTC
+       // 2001-09-09 01:46:40 +0000 UTC
+       // 1000000000
+       // 1000000000000000000
 }
 
 func ExampleTime_Round() {