Your third picture doesn't show the countdown for the next Bitcoin halving. It shows one for the Bitcoin Cash halving. You might want to remove that one or change it to the correct picture from that site. 

Lol, BCH halving? 

Anyways, those bitcoin block halving count down is not that accurate, it's just an approximate I believed.

Others could be off by as much as 3 days, so I guess everyone should take the average of each website to at least get the picture of the date itself.

One thing I've noticed is that, they probably have nearly the same time for us to watch and I wonder what algorithm they've made to calculate it because basically the bitcoin halving will not depend on the time but the rate for the creation of new blocks for bitcoin. This might be the reason how they've calculate it.

Anyways, with bitcoin halving getting near, I also sense that the rate of post concerning it will increase as we go nearer, and this might be considered as a hype. Believe me or not, the actual effect of bitcoin halving isn't the same for what most of the members here mostly anticipate.

I would follow up on the one displayed by Binance and Coingecko for all the latest changes that may come forth. Many people are anticipating huge ROIs on their plans but i doubt we will see a major rise in the price of bitcoin. Let's see how the market will react to this halving reward, i have already accumulated some bitcoins thought hopefully the price will rise a little lol.

Here, I found some threads about the bitcoin block halving countdown

bitcoin Block Reward Halving countdown.
Bitcoin Halving Countdown and Other Data

Are you sure you edited @OP, I'm still seeing BCH countdown there.

These are just rough estimates, we will never know the real time/date, just saying.

You can add this link too:
https://blockchair.com/bitcoin/

Although, I don't like they added BCH and BSV halving countdown too but they offer more data such as the current block, halving block, blocks remaining...

Halving is so close and I think we would see more threadd about it soon,
Like whenever the price moves some member would post it and claims that it is because of halving.
But it is great to always know when would an event such as this would occur so this count downs and clock are very helpful.

It should have been this page https://www.coingecko.com/en/explain/bitcoin_halving 

We can actually consider it as a good sign. Amidst having too many clocks, we must see through it that what we are expecting is very near to come and we must all set our selves ready for it. Bitcoin's value will definitely go high as halving occurs that's why buying now while the price is much cheaper would be a very great idea which may bring you much income as it draw near. We must always keep our watch on bitcoin's value so that we can make the most from the halving that is about to happen, let us not let it slip out of our hands.

It seems like each of the sites are using different formulas to calculates the time before the halving.
Binance Academy is showing that the halving is going to be on May 12th , while the other is showing that it’s going to be on May 9th.

But, I think that Binance Academy site is the accurate one, they made an explanation of how hey calculate it using a different formula from the other sites. I can’t really wait to see the Halving take place. The price has been in the $9k to $10k circle, hope it doesn’t go below that. And I really would like to see an increase after this next Halving.