Chinese Valentine Day fall on 17-th August in 2018. This festival has lasted over 2000 years.
Story quick version: An oxherd Niulang with the help of his ox (the demoted cattle god) married a fairy, Zhinü, who became a weaver girl. Her mother, a goddess, returned Zhinü to heaven. Niulang pursued using the ox's hide. The goddess separated them by a river of stars (the Milky Way), but magpies were allowed to form a bridge for them to meet once a year (Qixi).
Show love and romance, giving flowers and chocolates to each other is the most traditional custom in China, like other countries worldwide to celebrate the Valentine’s Day.