Once upon a time there was no time. There was just a dot. The dot exploded into space and time.

There was a violent result and the dot split into the universe and the antiverse. The universe went forward in time and the antiverse went backward in time.

The speed of the universe in time determines the speed of light, and is opposite of the speed of the antiverse. The antiverse and the universe are being driven appart by dark energy.

As a result time goes in one direction in the universe and in the opposite direction in the antiverse. The universe is matter, and the antiverse is antimatter.