8:15

8:15 is not just a “Lost” reference. Adam and Eddy have confirmed that the time is a major nod to the animated Disney film “Peter Pan.” In that version, Peter takes the Darling children to NL and they land on the hands of Big Ben, at 8:15.
There is actually a thread called “The Significance of 8:15” if you want to read more on the subject.

The PP story is Eddy Kitsis’ favorite fairytale and so the fact that Adam and Eddy have woven in a reference to that Dinsey film since the pilot (the clock in SB was stuck at the time 8:15 until Emma decided to stay in town) means that the writers wanted to include Peter Pan ever since S1. They have said it was simply a matter of acquiring the rights to retell that story in their own way, which they did. The clock being stuck at 8:15, Big Ben being at 8:15 when the Shadow took Baelfire to NL, and now Henry being born at 8:15 suggests that Peter Pan was behind it all. Peter Pan said to Henry that it was not merely a coincidence that the spawn of the Dark One (aka Baelfire) had a child with Emma, the product of true love. Peter Pan planned for Henry to be born of both dark and light magic. Also, SB being frozen for 28 years at 8:15 suggests that PP is behind the dark curse, which ultimately resulted in Henry becoming the truest believer in magic.