How to Efficiently Create a `time.Time` Object for a Specific Time on the Following Day?

How to Retrieve a Specific Time on the Next Day

Overview

This article aims to provide a solution for creating a time.Time object representing a specific time on the following day. We will explore a concise and efficient approach to achieve this.

The Challenge

The task is to create a time.Time object for a given hour and minute on the following day. The code provided initially offers a straightforward solution:

now := time.Now()
tomorrow := time.Date(now.Year(), now.Month(), now.Day(), 15, 0, 0, 0, time.UTC).AddDate(0, 0, 1)

While this method works effectively, it involves multiple method calls and can be quite verbose.

An Optimized Solution

To enhance efficiency and brevity, we can leverage the Date function and utilize the AddDate method to modify the created date. This approach minimizes the number of function calls and method invocations:

import "time"

...

yyyy, mm, dd := now.Date()
tomorrow := time.Date(yyyy, mm, dd+1, 15, 0, 0, 0, now.Location())

This code snippet accomplishes the same task with fewer operations, making it both efficient and concise.

Benchmark Results

To evaluate the performance of the optimized solution, we conducted benchmarking tests against the original code and another approach by PeterSO on Stack Overflow:

BenchmarkNow-8                  31197811            36.6 ns/op
BenchmarkTomorrowPeterSO-8      29852671            38.4 ns/op
BenchmarkTomorrowJens-8          9523422           124 ns/op

The results indicate that the optimized solution is significantly faster, outperforming both the original and PeterSO's approaches. This confirms the efficiency of the proposed method.

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