How to Efficiently Get a Specific Time for the Following Day in Go?

How to Get a Specific Time the Following Day

Introduction

Getting an exact time for the next day can be a common task when working with dates and times in Go. This article explores a shorter and efficient approach to achieve this goal.

Problem

The existing code effectively creates a time for a specific point in time the following day by adding one day to a Date with the desired hour and minute. However, it involves multiple function calls and can be verbose.

Answer

The time package in Go provides a more concise way to achieve the desired result. The Round(0) method can be used to round the current time to the nearest whole second. Using this rounded time as a base, a new time can be created by setting the date values separately.

Efficient Code

<code class="go">package main

import (
    "fmt"
    "time"
)

func main() {
    now := time.Now().Round(0)
    yyyy, mm, dd := now.Date()
    tomorrow := time.Date(yyyy, mm, dd+1, 15, 0, 0, 0, now.Location())
    fmt.Println(tomorrow)
}</code>

How it Works

This code works by:

1. Getting the current time and rounding it to the nearest whole second using now.Round(0).
2. Extracting the year, month, and day from the rounded time.
3. Creating a new time tomorrow using time.Date with the extracted year, month, and day values, along with the desired hour, minute, and second values.
4. Setting the location of tomorrow to the location of the current time.

Optimization

This code is optimized by minimizing calls to time package functions and methods. By calculating the year, month, and day only once, and then reusing them to create tomorrow, the number of function calls is significantly reduced.

Benchmark Results

Benchmarks show that this optimized approach outperforms other methods. The following table displays the benchmark results:

Benchmark	Operations per Second
BenchmarkNow	31197811
BenchmarkTomorrowPeterSO	29852671
BenchmarkTomorrowJens	9523422

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