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Darinel Cigarroa
Asked: 2022-08-29 14:25:39 +0800 CST 2022-08-29 14:25:39 +0800 CST

How to convert String to date in Golang?

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Hello everyone in advance, thank you very much for your answers and comments. I want to achieve the following I have a date which I get from the database with the following format this date is a string and I store it in the date variable:

date := "2015-02-01T00:00:00Z"

I want to transform said date to the date data type to extract the year with the YEAR() function, which gives me something like the following:

date := "2015-02-01"

I am trying as follows:

    newDate, error := time.Parse("2022-02-01", date)
    if error != nil {
        fmt.Println(error)
    }
    println("año", date.Year())

However, this returns a 1 and should return 2015, printing the parse returns this:

parsing time "2022-02-01T00:00:00Z" as "2022-02-01": cannot parse "-02-01T00:00:00Z" as "2"

If I print the date variable after parsing, I see that it returns this:

0001-01-01 00:00:00 +0000 UTC

I think what is generating the error are the seconds, minutes and hours in my string but I don't know how to solve it.

I share link to Go Playground: Go playground

date

2 Answers

  1. The solution to my question is the following:

    Since we have a string with the following format

    date := "2015-02-01T00:00:00Z"

    The first thing we have to do is remove "T00:00:00Z", we achieve that with the following code

    temporalDate := strings.TrimSuffix(date, "T00:00:00Z")

    Up to this point our variable is still a string if we want to have access to the functions of the time package, we have to parse the string to a date

    anniversary, err := time.Parse("2006-01-02", temporalDate)
    if err != nil {
        fmt.Println("error", err)
    }

    And with this we already have access to methods of the time package for example:

    anniversary.Year()
    • 2
  2. Best Answer

    It is not necessary to do that manual trim, you can simply specify the format to the method Parse()in your case it would be RFC3339, I leave you an example:

    date := "2015-02-01T00:00:00Z"

anniversary, err := time.Parse(time.RFC3339, date)
if err != nil {
    fmt.Println("Could not parse time:", err)
}

fmt.Println(anniversary)
fmt.Println(anniversary.Year())

    you can see all the supported formats in the Go documentation.

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