Thank you for the answer. I read that "since" with the date mean "from that date till today", so I was confused. I wanted to say that from the 1st November I'll be forever his - but have just limited amount of words for using.
I assume the first was to be written in a card or at the end of a love letter or similar, so I didn't expect it to be a full sentence. To this day, I still forget that AmE reverses the date so to me, that only meant the 1st of November 2014.