1. 問題現象

在使用 Go 語言的 time.Parse 解析時間時遇到以下錯誤：

func main() {timeParse, err := time.Parse("2006-11-02 15:04:05", "2020-05-22 10:25:30")if err != nil {fmt.Println("time parse failed: ", err)}fmt.Printf("timeParse is %v, type is %T", timeParse, timeParse)
}

報錯：

time parse failed:  parsing time "2020-05-22 10:25:30": month out of range
timeParse is 0001-01-01 00:00:00 +0000 UTC, type is time.Time

2. 問題分析

查看源碼發現有以下描述

Parse parses a formatted string and returns the time value it represents. The layout defines the format by showing how the reference time, defined to be Mon Jan 2 15:04:05 -0700 MST 2006 would be interpreted if it were the value; it serves as an example of the input format. The same interpretation will then be made to the input string.

layout 這個參數是被定義為 Mon Jan 2 15:04:05 -0700 MST 2006

3. 問題解決

我們修改 “2006-11-02 15:04:05” 為 “2006-01-02 15:04:05”

func main() {timeParse, err := time.Parse("2006-01-02 15:04:05", "2020-05-22 10:25:30")if err != nil {fmt.Println("time parse failed: ", err)}fmt.Printf("timeParse is %v, type is %T", timeParse, timeParse)// timeParse is 2020-05-22 10:25:30 +0000 UTC, type is time.Time
}

執行結果：

timeParse is 2020-05-22 10:25:30 +0000 UTC, type is time.Time

官方定義的時間格式常量：

const (ANSIC       = "Mon Jan _2 15:04:05 2006"UnixDate    = "Mon Jan _2 15:04:05 MST 2006"RubyDate    = "Mon Jan 02 15:04:05 -0700 2006"RFC822      = "02 Jan 06 15:04 MST"RFC822Z     = "02 Jan 06 15:04 -0700" // RFC822 with numeric zoneRFC850      = "Monday, 02-Jan-06 15:04:05 MST"RFC1123     = "Mon, 02 Jan 2006 15:04:05 MST"RFC1123Z    = "Mon, 02 Jan 2006 15:04:05 -0700" // RFC1123 with numeric zoneRFC3339     = "2006-01-02T15:04:05Z07:00"RFC3339Nano = "2006-01-02T15:04:05.999999999Z07:00"Kitchen     = "3:04PM"
)

總結

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