Colin Cross | 7bb052a | 2015-02-03 12:59:37 -0800 | [diff] [blame^] | 1 | // Copyright 2011 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | package time_test |
| 6 | |
| 7 | import ( |
| 8 | "fmt" |
| 9 | "time" |
| 10 | ) |
| 11 | |
| 12 | func expensiveCall() {} |
| 13 | |
| 14 | func ExampleDuration() { |
| 15 | t0 := time.Now() |
| 16 | expensiveCall() |
| 17 | t1 := time.Now() |
| 18 | fmt.Printf("The call took %v to run.\n", t1.Sub(t0)) |
| 19 | } |
| 20 | |
| 21 | var c chan int |
| 22 | |
| 23 | func handle(int) {} |
| 24 | |
| 25 | func ExampleAfter() { |
| 26 | select { |
| 27 | case m := <-c: |
| 28 | handle(m) |
| 29 | case <-time.After(5 * time.Minute): |
| 30 | fmt.Println("timed out") |
| 31 | } |
| 32 | } |
| 33 | |
| 34 | func ExampleSleep() { |
| 35 | time.Sleep(100 * time.Millisecond) |
| 36 | } |
| 37 | |
| 38 | func statusUpdate() string { return "" } |
| 39 | |
| 40 | func ExampleTick() { |
| 41 | c := time.Tick(1 * time.Minute) |
| 42 | for now := range c { |
| 43 | fmt.Printf("%v %s\n", now, statusUpdate()) |
| 44 | } |
| 45 | } |
| 46 | |
| 47 | func ExampleMonth() { |
| 48 | _, month, day := time.Now().Date() |
| 49 | if month == time.November && day == 10 { |
| 50 | fmt.Println("Happy Go day!") |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | func ExampleDate() { |
| 55 | t := time.Date(2009, time.November, 10, 23, 0, 0, 0, time.UTC) |
| 56 | fmt.Printf("Go launched at %s\n", t.Local()) |
| 57 | // Output: Go launched at 2009-11-10 15:00:00 -0800 PST |
| 58 | } |
| 59 | |
| 60 | func ExampleTime_Format() { |
| 61 | // layout shows by example how the reference time should be represented. |
| 62 | const layout = "Jan 2, 2006 at 3:04pm (MST)" |
| 63 | t := time.Date(2009, time.November, 10, 15, 0, 0, 0, time.Local) |
| 64 | fmt.Println(t.Format(layout)) |
| 65 | fmt.Println(t.UTC().Format(layout)) |
| 66 | // Output: |
| 67 | // Nov 10, 2009 at 3:00pm (PST) |
| 68 | // Nov 10, 2009 at 11:00pm (UTC) |
| 69 | } |
| 70 | |
| 71 | func ExampleParse() { |
| 72 | // longForm shows by example how the reference time would be represented in |
| 73 | // the desired layout. |
| 74 | const longForm = "Jan 2, 2006 at 3:04pm (MST)" |
| 75 | t, _ := time.Parse(longForm, "Feb 3, 2013 at 7:54pm (PST)") |
| 76 | fmt.Println(t) |
| 77 | |
| 78 | // shortForm is another way the reference time would be represented |
| 79 | // in the desired layout; it has no time zone present. |
| 80 | // Note: without explicit zone, returns time in UTC. |
| 81 | const shortForm = "2006-Jan-02" |
| 82 | t, _ = time.Parse(shortForm, "2013-Feb-03") |
| 83 | fmt.Println(t) |
| 84 | |
| 85 | // Output: |
| 86 | // 2013-02-03 19:54:00 -0800 PST |
| 87 | // 2013-02-03 00:00:00 +0000 UTC |
| 88 | } |
| 89 | |
| 90 | func ExampleParseInLocation() { |
| 91 | loc, _ := time.LoadLocation("Europe/Berlin") |
| 92 | |
| 93 | const longForm = "Jan 2, 2006 at 3:04pm (MST)" |
| 94 | t, _ := time.ParseInLocation(longForm, "Jul 9, 2012 at 5:02am (CEST)", loc) |
| 95 | fmt.Println(t) |
| 96 | |
| 97 | // Note: without explicit zone, returns time in given location. |
| 98 | const shortForm = "2006-Jan-02" |
| 99 | t, _ = time.ParseInLocation(shortForm, "2012-Jul-09", loc) |
| 100 | fmt.Println(t) |
| 101 | |
| 102 | // Output: |
| 103 | // 2012-07-09 05:02:00 +0200 CEST |
| 104 | // 2012-07-09 00:00:00 +0200 CEST |
| 105 | } |
| 106 | |
| 107 | func ExampleTime_Round() { |
| 108 | t := time.Date(0, 0, 0, 12, 15, 30, 918273645, time.UTC) |
| 109 | round := []time.Duration{ |
| 110 | time.Nanosecond, |
| 111 | time.Microsecond, |
| 112 | time.Millisecond, |
| 113 | time.Second, |
| 114 | 2 * time.Second, |
| 115 | time.Minute, |
| 116 | 10 * time.Minute, |
| 117 | time.Hour, |
| 118 | } |
| 119 | |
| 120 | for _, d := range round { |
| 121 | fmt.Printf("t.Round(%6s) = %s\n", d, t.Round(d).Format("15:04:05.999999999")) |
| 122 | } |
| 123 | // Output: |
| 124 | // t.Round( 1ns) = 12:15:30.918273645 |
| 125 | // t.Round( 1µs) = 12:15:30.918274 |
| 126 | // t.Round( 1ms) = 12:15:30.918 |
| 127 | // t.Round( 1s) = 12:15:31 |
| 128 | // t.Round( 2s) = 12:15:30 |
| 129 | // t.Round( 1m0s) = 12:16:00 |
| 130 | // t.Round( 10m0s) = 12:20:00 |
| 131 | // t.Round(1h0m0s) = 12:00:00 |
| 132 | } |
| 133 | |
| 134 | func ExampleTime_Truncate() { |
| 135 | t, _ := time.Parse("2006 Jan 02 15:04:05", "2012 Dec 07 12:15:30.918273645") |
| 136 | trunc := []time.Duration{ |
| 137 | time.Nanosecond, |
| 138 | time.Microsecond, |
| 139 | time.Millisecond, |
| 140 | time.Second, |
| 141 | 2 * time.Second, |
| 142 | time.Minute, |
| 143 | 10 * time.Minute, |
| 144 | time.Hour, |
| 145 | } |
| 146 | |
| 147 | for _, d := range trunc { |
| 148 | fmt.Printf("t.Truncate(%6s) = %s\n", d, t.Truncate(d).Format("15:04:05.999999999")) |
| 149 | } |
| 150 | |
| 151 | // Output: |
| 152 | // t.Truncate( 1ns) = 12:15:30.918273645 |
| 153 | // t.Truncate( 1µs) = 12:15:30.918273 |
| 154 | // t.Truncate( 1ms) = 12:15:30.918 |
| 155 | // t.Truncate( 1s) = 12:15:30 |
| 156 | // t.Truncate( 2s) = 12:15:30 |
| 157 | // t.Truncate( 1m0s) = 12:15:00 |
| 158 | // t.Truncate( 10m0s) = 12:10:00 |
| 159 | // t.Truncate(1h0m0s) = 12:00:00 |
| 160 | } |