The first day of the Chinese lunisolar* calendar is the new moon night between January 19th & February 21st. Traditionally the New Year was celebrated for two weeks.
Year of the (Black Water) Snake begins on: Sunday, Feb. 10, 2013. The next Chinese New Years start: Jan. 31, 2014 (horse); 2/19/15(goat); 2/8/16(monkey); 1/28/17(rooster); 2/16/18; and 2/5/19. The cycle starts again in 2020, A Year of the Rat.
(*) - lunisolar, not purely lunar like the Islamic calendar.