According to the blog of the man who runs it, it was from 2002-2005: https://misterirvine.wordpress.com/2011/07/15/explain-entran...
« I am a husband and father. The reason I was born was to become my daughter’s father. I was wise enough to notice and appreciate at the time, the slow ecstatic joy my child’s early years were giving me. So too have her later years. I will die happy. »
Beautiful.
Genius.