How to determine whether the time is the previous day in Go language?

How to determine whether the time is the previous day in Go language?

In the Go language, we often need to operate and judge dates and times. Sometimes we need to determine whether a given time is the previous day, which is very common in some demand scenarios. This article will introduce how to determine whether the time is the previous day in Go language and provide specific code examples.

First, we need to import the "time" package in the Go language standard library to facilitate time operations. The code is as follows:

import (
    "time"
)

Next, we need to write a function that accepts a parameter of type time.Time, and then determines whether the time is the previous day. The following is a complete code example:

package main

import (
    "fmt"
    "time"
)

func isYesterday(t time.Time) bool {
    now := time.Now()
    yesterday := now.AddDate(0, 0, -1)

    year, month, day := t.Date()
    yearNow, monthNow, dayNow := yesterday.Date()

    if year == yearNow && month == monthNow && day == dayNow {
        return true
    }

    return false
}

func main() {
    t := time.Date(2022, time.September, 21, 0, 0, 0, 0, time.UTC)
    if isYesterday(t) {
        fmt.Println("给定的时间是昨天！")
    } else {
        fmt.Println("给定的时间不是昨天！")
    }
}

In the above code, we define a function named isYesterday, which accepts a parameter t of type time.Time and returns a Boolean value indicating that Whether the specified time is the previous day. We first get the current time now, and then get yesterday's time yesterday through now.AddDate(0, 0, -1). Next, we compare the parameter t with the year, month, and day of yesterday. If they are equal, it means that the given time is the previous day and return true; otherwise, return false.

In the main function, we create a time t, and then call the isYesterday function to determine whether the time is the previous day and output the result.

Summary: Through the introduction and code examples of this article, you should now know how to determine whether the time is the previous day in Go language. Hope this helps!

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