🧠 How I Made a Backdated Git Commit Show on GitHub Contributions

🎯 Goal

I wanted to make a commit on GitHub with a custom past date - specifically, July 1, 2025, at 12:00 PM - to reflect the actual date the work was completed on my GitHub profile.

Sounds easy, right? I thought so too.
But here's how it actually went 😅

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📍Step 1: Creating the Commit Locally

I made a small change in my project and staged it with:

$ echo "Backdated test" >> backdated.txt
$ git add backdated.txt

To commit with a custom timestamp, I used:

$ GIT_AUTHOR_DATE="2025-07-01T12:00:00" GIT_COMMITTER_DATE="2025-07-01T12:00:00" git commit -m "Backdated commit to July 1, 2025"

✅ This created a commit with the exact timestamp I wanted.

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❌ Problem 1: bash: commit: command not found

At first, Git Bash wouldn’t recognize the commit command because I broke it across lines incorrectly.

Fix: Run the full commit command on a single line, or use backslashes with proper spacing.

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❌ Problem 2: Push Rejected

When I tried to push to GitHub, it said:

error: failed to push some refs to origin

Turns out, Git wouldn't let me push because my local branch and the remote had different histories.

Fix: I pulled the latest changes using this:

$ git pull origin main --allow-unrelated-histories

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❌ Problem 3: Vim Nightmare

During that pull, Git launched Vim to ask for a merge message... and I got stuck inside it.

Fix: Exited Vim by pressing:

$ Esc
:wq
Enter

Classic Git developer moment.

[Screenshot- Vim Window in git Bash terminal]

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✅ Final Steps

After escaping Vim, I added the file again just to be sure, then committed and pushed:

$ git add backdated.txt

GIT_AUTHOR_DATE="2025-07-01T12:00:00" GIT_COMMITTER_DATE="2025-07-01T12:00:00" git commit -m "Backdated push for July 1, 2025"

git push origin main

This time - everything worked.

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🟩 The Green Square Appears

I went to my GitHub profile and hovered over July 1, 2025. Finally saw:

📸 [Screenshot: GitHub contribution graph showing green square on July 1, 2025]

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💡 What I Learned (the hard way)

• Backdating commits is possible - but only if you set the environment variables correctly.

• GitHub counts a commit only if:

  • It’s pushed to the default branch (usually main)

  • It uses a verified email linked to your GitHub account

• Git can reject pushes if the histories don’t match - --allow-unrelated-histories is your friend

• Git Bash doesn’t support Ctrl + V (use right-click to paste) (funny…)

• Vim will trap you if you’re not prepared

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🧘 Final Thoughts

All of this… just to get one green square on the contribution graph.
Was it a lot?
Yes.
Was it worth it?
Absolutely. 😄

If you’re ever trying to do the same and getting stuck, just remember - I did too.

~Ayush Hardeniya