Title: How to determine whether a date is the previous day in Go language?

In daily development, we often encounter situations where we need to determine whether the date is the previous day. In the Go language, we can implement this function through time calculation. The following will be combined with specific code examples to demonstrate how to determine whether the date is the previous day in Go language.

First, we need to import the time package in the Go language. The code is as follows:

import (
    "time"
)

Next, we define a function IsYesterday, which accepts a time object as a parameter , used to determine whether the time is yesterday. The specific code is as follows:

func IsYesterday(t time.Time) bool {
    yesterday := time.Now().AddDate(0, 0, -1)
    return t.Year() == yesterday.Year() && t.Month() == yesterday.Month() && t.Day() == yesterday.Day()
}

In the above code, we first obtain the time object of the day before the current time yesterday, and then determine the incoming time object t Is it the same as the previous day? If the year, month, and day are the same, true is returned, otherwise false is returned.

Next, we can write a simple test function to verify whether the above code is correct. The specific code is as follows:

func main() {
    today := time.Now()
    yesterday := time.Now().AddDate(0, 0, -1)
    
    fmt.Println("Today:", today)
    fmt.Println("Is yesterday?:", IsYesterday(today)) // 輸出 false
    
    fmt.Println("Yesterday:", yesterday)
    fmt.Println("Is yesterday?:", IsYesterday(yesterday)) // 輸出 true
}

In the above test function, we printed the current time and the previous time respectively. The time of day, and the IsYesterday function is called to determine whether the two times are the previous day. Finally, the corresponding output results will be obtained, which verifies the correctness of the date judgment code we wrote.

In summary, through the above code examples, we have learned how to determine whether a date is the previous day in Go language. This method can easily help us handle date-related logic and improve the readability and flexibility of the code. I hope readers can master this technique and use it flexibly in actual project development.

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