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Go语言教程之边写边学：基础练习：从当前日期和时间获取年、月、日、小时、分钟和秒

下面的程序使用解析函数从当前日期和时间获取年、月、日、小时、分钟和秒。Clock函数用于返回时间T指定的一天内的小时、分钟和秒。

示例代码：

package main
 
 import (
         "fmt"
         "time"     
 )
 
 func main() {       
    currentTime := time.Now()        
    fmt.Println("\n######################################\n")
    fmt.Println(currentTime.Format("2006-01-02 15:04:05"))
     
    fmt.Println("\n######################################\n")   
    timeStampString := currentTime.Format("2006-01-02 15:04:05")    
    layOut := "2006-01-02 15:04:05"     
    timeStamp, err := time.Parse(layOut, timeStampString)
    if err != nil {
        fmt.Println(err)          
    }   
    hr, min, sec := timeStamp.Clock()
     
    fmt.Println("Year   :", currentTime.Year())
    fmt.Println("Month  :", currentTime.Month())
    fmt.Println("Day    :", currentTime.Day())
    fmt.Println("Hour   :", hr)
    fmt.Println("Min    :", min)
    fmt.Println("Sec    :", sec)    
     
    fmt.Println("\n######################################\n")   
    year, month, day := time.Now().Date()
    fmt.Println("Year   :", year)
    fmt.Println("Month  :", month)
    fmt.Println("Day    :", day)
     
    fmt.Println("\n######################################\n")          
    t := time.Now()
     
    y := t.Year()
    mon := t.Month()
    d := t.Day()
    h := t.Hour()
    m := t.Minute()
    s := t.Second()
    n := t.Nanosecond()
     
    fmt.Println("Year   :",y)
    fmt.Println("Month   :",mon)
    fmt.Println("Day   :",d)
    fmt.Println("Hour   :",h)
    fmt.Println("Minute :",m)
    fmt.Println("Second :",s)
    fmt.Println("Nanosec:",n)
}

输出：

######################################

2017-08-27 18:11:54

######################################

Year    : 2017
Month   : August
Day     : 27
Hour    : 18
Min     : 11
Sec     : 54

######################################

Year    : 2017
Month   : August
Day     : 27

######################################

Year   : 2017
Month   : August
Day   : 27
Hour   : 18
Minute : 11
Second : 54
Nanosec: 319513100

Go语言教程之边写边学：基础练习：将年、月、日、小时、分钟、秒、毫秒、微秒和纳秒从当前日期时间减去

以下是从当前时间减去指定的日期或时间，与增加时的方法相同，AddDate用于计算日期，Add用于计算时间，只不过减去时用的是负数。

示例代码：

package main
 
import (
    "fmt"
    "time"
)
 
func main() {
    now := time.Now()
    fmt.Println("Today:", now)
     
    after := now.AddDate(-1, 0, 0)
    fmt.Println("Subtract 1 Year:", after)
     
    after = now.AddDate(0, -1, 0)
    fmt.Println("Subtract 1 Month:", after)
     
    after = now.AddDate(0, 0, -1)
    fmt.Println("Subtract 1 Day:", after)
     
    after = now.AddDate(-2, -2, -5)
    fmt.Println("Subtract multiple values:", after)
     
    after = now.Add(-10*time.Minute)
    fmt.Println("Subtract 10 Minutes:", after)
     
    after = now.Add(-10*time.Second)
    fmt.Println("Subtract 10 Second:", after)
     
    after = now.Add(-10*time.Hour)
    fmt.Println("Subtract 10 Hour:", after)
     
    after = now.Add(-10*time.Millisecond)
    fmt.Println("Subtract 10 Millisecond:", after)
     
    after = now.Add(-10*time.Microsecond)
    fmt.Println("Subtract 10 Microsecond:", after)
     
    after = now.Add(-10*time.Nanosecond)
    fmt.Println("Subtract 10 Nanosecond:", after)
}

输出：

Today: 2017-08-27 12:21:17.8379942 +0530 IST
Subtract 1 Year: 2016-08-27 12:21:17.8379942 +0530 IST
Subtract 1 Month: 2017-07-27 12:21:17.8379942 +0530 IST
Subtract 1 Day: 2017-08-26 12:21:17.8379942 +0530 IST
Subtract multiple values: 2015-06-22 12:21:17.8379942 +0530 IST
Subtract 10 Minutes: 2017-08-27 12:11:17.8379942 +0530 IST
Subtract 10 Second: 2017-08-27 12:21:07.8379942 +0530 IST
Subtract 10 Hour: 2017-08-27 02:21:17.8379942 +0530 IST
Subtract 10 Millisecond: 2017-08-27 12:21:17.8279942 +0530 IST
Subtract 10 Microsecond: 2017-08-27 12:21:17.8379842 +0530 IST
Subtract 10 Nanosecond: 2017-08-27 12:21:17.83799419 +0530 IST

Go语言教程之边写边学：基础练习：将年、月、日、小时、分钟、秒、毫秒、微秒和纳秒添加到当前日期时间

以下是在golang中进行常规时间计算的方法。AddDate用于日期计算，Add用于时间计算。

示例代码：

package main
 
import (
    "fmt"
    "time"
)
 
func main() {
    now := time.Now()
    fmt.Println("\nToday:", now)
     
    after := now.AddDate(1, 0, 0)
    fmt.Println("\nAdd 1 Year:", after)
     
    after = now.AddDate(0, 1, 0)
    fmt.Println("\nAdd 1 Month:", after)
     
    after = now.AddDate(0, 0, 1)
    fmt.Println("\nAdd 1 Day:", after)
     
    after = now.AddDate(2, 2, 5)
    fmt.Println("\nAdd multiple values:", after)
     
    after = now.Add(10*time.Minute)
    fmt.Println("\nAdd 10 Minutes:", after)
     
    after = now.Add(10*time.Second)
    fmt.Println("\nAdd 10 Second:", after)
     
    after = now.Add(10*time.Hour)
    fmt.Println("\nAdd 10 Hour:", after)
     
    after = now.Add(10*time.Millisecond)
    fmt.Println("\nAdd 10 Millisecond:", after)
     
    after = now.Add(10*time.Microsecond)
    fmt.Println("\nAdd 10 Microsecond:", after)
     
    after = now.Add(10*time.Nanosecond)
    fmt.Println("\nAdd 10 Nanosecond:", after)
}

输出：

Today: 2017-08-27 11:17:54.1224628 +0530 IST

Add 1 Year: 2018-08-27 11:17:54.1224628 +0530 IST

Add 1 Month: 2017-09-27 11:17:54.1224628 +0530 IST

Add 1 Day: 2017-08-28 11:17:54.1224628 +0530 IST

Add multiple values: 2019-11-01 11:17:54.1224628 +0530 IST

Add 10 Minutes: 2017-08-27 11:27:54.1224628 +0530 IST

Add 10 Second: 2017-08-27 11:18:04.1224628 +0530 IST

Add 10 Hour: 2017-08-27 21:17:54.1224628 +0530 IST

Add 10 Millisecond: 2017-08-27 11:17:54.1324628 +0530 IST

Add 10 Microsecond: 2017-08-27 11:17:54.1224728 +0530 IST

Add 10 Nanosecond: 2017-08-27 11:17:54.12246281 +0530 IST

Go语言教程之边写边学：基础练习：获取两个日期之间的小时、天、分钟和秒差 [未来和过去]

以下是计算两个时间之间之差的方法，具体到天，时，分，秒。

示例代码：

package main
 
import (
         "fmt"
         "time"
)
 
func main() {
loc, _ := time.LoadLocation("UTC")
now := time.Now().In(loc)
fmt.Println("\nToday : ", loc, " Time : ", now)
 
pastDate := time.Date(2015, time.May, 21, 23, 10, 52, 211, time.UTC)
fmt.Println("\n\nPast  : ", loc, " Time : ", pastDate) // 
fmt.Printf("###############################################################\n")
diff := now.Sub(pastDate)
 
hrs := int(diff.Hours())
fmt.Printf("Diffrence in Hours : %d Hours\n", hrs)
 
mins := int(diff.Minutes())
fmt.Printf("Diffrence in Minutes : %d Minutes\n", mins)
 
second := int(diff.Seconds())
fmt.Printf("Diffrence in Seconds : %d Seconds\n", second)
 
days := int(diff.Hours() / 24)
fmt.Printf("Diffrence in days : %d days\n", days)
 
fmt.Printf("###############################################################\n\n\n")
 
futureDate := time.Date(2019, time.May, 21, 23, 10, 52, 211, time.UTC)
fmt.Println("Future  : ", loc, " Time : ", futureDate) // 
fmt.Printf("###############################################################\n")
diff = futureDate.Sub(now)
 
hrs = int(diff.Hours())
fmt.Printf("Diffrence in Hours : %d Hours\n", hrs)
 
mins = int(diff.Minutes())
fmt.Printf("Diffrence in Minutes : %d Minutes\n", mins)
 
second = int(diff.Seconds())
fmt.Printf("Diffrence in Seconds : %d Seconds\n", second)
 
days = int(diff.Hours() / 24)
fmt.Printf("Diffrence in days : %d days\n", days)
 
}

输出：

Today :  UTC  Time :  2017-08-27 05:15:53.7106215 +0000 UTC


Past  :  UTC  Time :  2015-05-21 23:10:52.000000211 +0000 UTC
###############################################################
Diffrence in Hours : 19878 Hours
Diffrence in Minutes : 1192685 Minutes
Diffrence in Seconds : 71561101 Seconds
Diffrence in days : 828 days
###############################################################


Future  :  UTC  Time :  2019-05-21 23:10:52.000000211 +0000 UTC
###############################################################
Diffrence in Hours : 15185 Hours
Diffrence in Minutes : 911154 Minutes
Diffrence in Seconds : 54669298 Seconds
Diffrence in days : 632 days

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