Your major name number is a 3 and your major birthdate number is a 6. That would account for an affinity for the number 36.

The 12 isn't that clear. Of course, the sequence of digits in 12 lead up to the 3, which may have an appeal to someone with an orderly mind. Or someone who enjoys what appears to be unique.

The entire time also reduces to 12 and then to 3:

1+2+3+6 = 12
1+2 = 3

The single-digit reduction to the number 3 is, again, your major name number.

So there are several ways the time might have a special significance to you, personally. But all of them are speculation.

The articles linked at the Index to 'Repetitively Seeing the Same Number' Articles may have information that can be of help.