Dativersery 

The date that marks the 1 year marks the 356th day following a couples first date.

Hey, Today is J's 1 year dativersery. I think we should take them out tonight to celebrate.

Dativersery by The Commonsensualist February 27, 2015

dateiversary 

The anniversary of your first date.

"We went on our first date five years ago today! Happy Dateiversary!"

dateiversary by TheDogNerd July 22, 2013

dadiversary 

The anniversary of the day you became a dad. Usually on the birthday of your oldest child.

Hey man I hear your kid just turned 10, Happy Dadiversary!

dadiversary by ditzydory November 26, 2016