如何从第二天开始指定时间

包装时间

import "time"

月，日，小时，分钟，秒和nsec值可能超出其通常范围，并将在转换过程中进行归一化。例如，10月32日转换为11月1日。

这样更有效。它最大程度地减少了对包

time

package mainimport (    "fmt"    "time")func main() {    now := time.Now()    fmt.Println(now.Round(0))    yyyy, mm, dd := now.Date()    tomorrow := time.Date(yyyy, mm, dd+1, 15, 0, 0, 0, now.Location())    fmt.Println(tomorrow)}

输出：

2019-06-21 16:23:06.525478162 -0400 EDT2019-06-22 15:00:00 -0400 EDT

一些基准：

BenchmarkNow-8       31197811 36.6 ns/opBenchmarkTomorrowPeterSO-8      29852671 38.4 ns/opBenchmarkTomorrowJens-8          9523422124 ns/op

bench_test.go

package mainimport (    "testing"    "time")func BenchmarkNow(b *testing.B) {    for N := 0; N < b.N; N++ {        now := time.Now()        _ = now    }}var now = time.Now()func BenchmarkTomorrowPeterSO(b *testing.B) {    for N := 0; N < b.N; N++ {        // now := time.Now()        yyyy, mm, dd := now.Date()        tomorrow := time.Date(yyyy, mm, dd+1, 15, 0, 0, 0, now.Location())        _ = tomorrow    }}func BenchmarkTomorrowJens(b *testing.B) {    for N := 0; N < b.N; N++ {        // now := time.Now()        tomorrow := time.Date(now.Year(), now.Month(), now.Day(), 15, 0, 0, 0, now.Location()).AddDate(0, 0, 1)        _ = tomorrow    }}