I will calculate your one billion second birthday

Do you know how old you are? Not in years. In *seconds*! Somewhere between 31 and 32 years, we also have a much cooler (but rarely celebrated) birthday. It's the second that we go from 999,999,999 to 1,000,000,000!! Find out when this is for you and throw yourself a surprise birthday party! That is, surprise your friends! I'll calculate the date and time you turn one billion seconds. Free Bonus - your 2&3 billion secs BDays!!