Deadline vs Dateline

You want to get this right once and for all.

No more getting confused deadline with dateline

Deadline is when the time limit is up. It is the cut-off point or the date when you have to finish your thesis, project or manuscript. 

If you don't submit your project by the deadline, you're dead meat. Your client is going to hound and haunt you for messing up with the given deadline.

You get it? If you don't finish by the deadline, you're good as dead, man. There goes your credibility, out the window.

It's a different thing with dateline though.

Dateline is a line at the head of a newspaper article showing the date and place of writing

If you miss it, so what? You can still read the news. 

Nobody cares you miss reading the dateline or that you don't read the news. It's none of their business anyway.

As a picture is worth a thousand words, maybe these photos will make you see the difference more clearly.

Examples of dateline:

See? That's dateline.

Same here, that's the dateline

Notice that here the byline and the dateline is right beneath the headline.

Examples of deadline: