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example4.go
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example4.go
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// Copyright 2014 Ardan Studios
//
// All material is licensed under the Apache License Version 2.0, January 2004
// http://www.apache.org/licenses/LICENSE-2.0
/*
// A Duration represents the elapsed time between two instants as
// an int64 nanosecond count. The representation limits the largest
// representable duration to approximately 290 years.
type Duration int64
// Common durations. There is no definition for units of Day or larger
// to avoid confusion across daylight savings time zone transitions.
const (
Nanosecond Duration = 1
Microsecond = 1000 * Nanosecond
Millisecond = 1000 * Microsecond
Second = 1000 * Millisecond
Minute = 60 * Second
Hour = 60 * Minute
)
// Add returns the time t+d.
func (t Time) Add(d Duration) Time
*/
// Sample program to show how literal, constant and variables work
// within the scope of implicit conversion.
package main
import (
"fmt"
"time"
)
func main() {
// Use the time package to get the current date/time.
now := time.Now()
// Subtract 5 nanoseconds from now using a literal constant.
literal := now.Add(-5)
// Subtract 5 seconds from now using a declared constant.
const timeout = 5 * time.Second // time.Duration(5) * time.Duration(1000000000)
constant := now.Add(-timeout)
// Subtract 5 nanoseconds from now using a variable of type int64.
minusFive := int64(-5)
variable := now.Add(minusFive)
// example4.go:48:21: cannot use minusFive (type int64) as type time.Duration in argument to now.Add
// Display the values.
fmt.Printf("Now : %v\n", now)
fmt.Printf("Literal : %v\n", literal)
fmt.Printf("Constant: %v\n", constant)
fmt.Printf("Variable: %v\n", variable)
}
// Outputs:
// Now : 2020-03-09 12:14:24.866045658 +0800 +08 m=+0.000059944
// Literal : 2020-03-09 12:14:24.866045653 +0800 +08 m=+0.000059939
// Constant: 2020-03-09 12:14:19.866045658 +0800 +08 m=-4.999940056