Today I Learned: Dealing with JSON DateTime when Unmarshal in
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65,514 reads

Today I Learned: Dealing with JSON DateTime when Unmarshal in Golang.

by Iman TumorangSeptember 20th, 2018
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Today I Learned: Dealing with JSON DateTime when Unmarshal in Golang. Iman Tumorang Software Engineer: "Beware the date-time standard!!" I’m not saying this is a bug, but this is only my story because of my lack of experience when dealing with DateTime and timezone in. as my routing library to ease me to handle my request. With echo, to receive the response body and unmarshal it to my struct, I can do it with a simple code like below.

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Beware the date-time standard!!

Look the start_time field. It changed from what I posted. What I want is, the stored data is same as what I posted from Postman.

I found that the issue happens because of the timezone obviously. So I just need to take care of the timezone. That was my first thought. I think my systems have a bug about this.

Resolving the Issue

To fix this issue, I’m doing all this action below.

Looking for the connection string in the connection driver

Because I’m using the MySQL as my DB storage, so I need a driver to connect my application with the MySQL. I’m using as my connection driver. So after looking for the documentation and checking my connection string, nothing wrong happen. I made it correctly.

dsn := root:root@tcp(

Rebuild the Datetime manually

Still curious, why this is happening. Then I’m trying to find any Q/A or Issue about this in StackOverflow or even in GitHub.

To be honest, it takes up to 2 hours for me when trying to fix this issue 🤦‍Until then, I got frustrated. So I have 2 option how to solve this.

  1. I will rebuild the start_time before stored to Database.
  2. Asking my team-mates (* even it feel so silly when asking this anyway🤦‍)

But, just want to give more effort 😶, I made the fix with rebuilding the DateTime.

startTime := e.StartTime

loc, _ := time.LoadLocation("Asia/Jakarta")

localStartTime := time.Date(startTime.Year(), startTime.Month(), startTime.Day(), startTime.Hour(), startTime.Minute(), startTime.Second(), startTime.Nanosecond(), loc)

Then, just out of curiosity, I ask my team about the issue. Then they look how I reproduce it, same as me, they also curious why this is happening. Until just a few minutes, one of my team found the reasons why this is happening.

This is happening because I made a wrong timezone offset in my request body.

{"title": "Core i13 Anniversarry","place": "Ancol Beach","start_time": "2018-09-22T12:42:31Z" // look for the `Z` indicator}

Because I lived in +7.00 timezone (Asia/Jakarta), it should be included in my JSON.

So, when I change the start_time from:




it solves my problem. Nothing wrong happened to my system. All is work perfectly.

When I realized this, I feel so dumb 🤦‍. I’ve spent my two hours of my life for nothing 🤦‍.

Lesson To be Learned

  • Always ask your team-mates first (if they were available anyway)
  • 2018–09–22T12:42:31+07:00 is the RFC 3339 format, every single character is matter.

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