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"panic: strconv.ParseInt: parsing "�": invalid syntax" –> when parting int64 to convert into time

July 24, 2022

In a DB I have a field of type int64 in which I store unix timestamp. Then I want to present it to the user as a normal datetime, as a string. However, it’ll fail. Here’s a simple example.

package main

import (
    "fmt"
    "strconv"
)

func main() {
    var a int64
    a = 1658545089
    tm, err := strconv.ParseInt(string(a), 10, 64)
    if err != nil {
        panic(err)
    }

    fmt.Println(tm)
}

===>

panic: strconv.ParseInt: parsing "�": invalid syntax

What’s going on here?

>Solution :

It is because you are trying to convert int64 with string
try it with strconv.FormatInt(a, 10)

package main

import (
    "fmt"
    "strconv"
)

func main() {
    var a int64
    a = 1658545089
    tm, err := strconv.ParseInt(strconv.FormatInt(a, 10), 10, 64)
    if err != nil {
        panic(err)
    }

    fmt.Println(tm)
}

when you try to convert an interger covering with string(), in golang it will get the corresponding ascii character
https://en.cppreference.com/w/cpp/language/ascii

after a certain interger it will only show �