After my colleague noticed me of this..."feature", I immediately thought I'd ask you all, why is it even implemented then?

We'll think about it this way, if they didn't put that in, I would have nothing to laugh at right now while on the toilet.

Sums up the usefulness of Microsoft right there

As a MS fanboy and a frequent participant in Dilbert-worthy meetings, I suspect the meeting to add the method went something like this..
Dev:"Why do I have to add the ToDouble method for DateTime?"
PHB:"Developer feedback. They demand the feature and developers are #1"
Dev: "No, seriously...no developer would ever, ever convert a DateTime to a double on purpose. This doesn't make any sense."
PHB: "Developers are our customers and customer satisfaction is our #1 goal. Add the method,or else!"

What was the "developer feedback"?

.NetBetaTester: "Hey, can I get a function to convert the DateTime to a double so I can manipulate how dates are calculated. Like adding days, subtracting minutes. Extend the Convert class and add ToDouble"
.NetEngineer: "No need. The DateTime extension methods have all that behavior."
.NetBetaTester: "Great! You saved me a ton of work."

PHB only read the *one* initial request and likely got a big bonus for "encouraging" the devs to add frivolous methods.

It's there in case you ever need to throw an InvalidCastException.

.net 1.1 says it's reserved for future use ..
https://msdn.microsoft.com/en-us/...(v=vs.71).aspx

so it seems like in the past it was reserved for the future but in the present it has no future use

i think the time DOUBLES UUUUP!!!!