问题描述
要获取今天时间对象的本地开始时间，我提取YMD并重建新日期。看起来像是在跳动。我还会错过其他一些标准库函数吗？
To get a local beginning of today time object I extract YMD and reconstruct the new date. That looks like a kludge. Do I miss some other standard library function?
代码也可以在：
func Bod(t time.Time) time.Time {
year, month, day := t.Date()
return time.Date(year, month, day, 0, 0, 0, 0, t.Location())
}
func main() {
fmt.Println(Bod(time.Now()))
}
推荐答案
问题的标题和文本都要求本地[芝加哥]开头今天时间。问题中的 Bod 函数正确地做到了这一点。 声称是更好的解决方案，但返回的结果不同；它不会在今天开始返回本地[芝加哥]。例如，
Both the title and the text of the question asked for "a local [Chicago] beginning of today time." The Bod function in the question did that correctly. The accepted Truncate function claims to be a better solution, but it returns a different result; it doesn't return a local [Chicago] beginning of today time. For example,
package main
import (
"fmt"
"time"
)
func Bod(t time.Time) time.Time {
year, month, day := t.Date()
return time.Date(year, month, day, 0, 0, 0, 0, t.Location())
}
func Truncate(t time.Time) time.Time {
return t.Truncate(24 * time.Hour)
}
func main() {
chicago, err := time.LoadLocation("America/Chicago")
if err != nil {
fmt.Println(err)
return
}
now := time.Now().In(chicago)
fmt.Println(Bod(now))
fmt.Println(Truncate(now))
}
输出：
2014-08-11 00:00:00 -0400 EDT
2014-08-11 20:00:00 -0400 EDT
时间截断方法会截断UTC时间。
The time.Truncate method truncates UTC time.
还假定一天中有24小时。芝加哥一天有23、24或25个小时。
The accepted Truncate function also assumes that there are 24 hours in a day. Chicago has 23, 24, or 25 hours in a day.
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