Gigasecond

Your task is to determine the date and time one gigasecond after a certain date.

A gigasecond is one thousand million seconds.
That is a one with nine zeros after it.

If you were born on January 24th, 2015 at 22:00 (10:00:00pm), then you would be a gigasecond old on October 2nd, 2046 at 23:46:40 (11:46:40pm).