Passage: On 21 January 2009, a bill was introduced in the Swedish Parliament to make the legal concept of marriage gender-neutral. The bill was passed on 1 April and took effect on 1 May. The bill was supported by all parties except the Christian Democrats and one member of Centre Party. It passed with 261 votes in favour, 22 votes against and 16 abstentions.

Question: When was the bill introduced to Swedish Parliament?
21 January 2009