The Swedish calendar was a calendar in use in Sweden and its possessions from 1 March 1700 until 30 February 1712; it was one day ahead of the Julian calendar and ten days behind the Gregorian calendar. Easter was nominally calculated astronomically from 1740 to 1844.

In November 1699, it was decided that Sweden would begin to adopt the Gregorian calendar, starting in 1700. The plan was to skip all leap days in the period 1700 to 1740, thus gradually approaching the Gregorian calendar over 40 years. According to plan, February 29 was omitted in 1700, but no further reductions were made in the following years due to the Great Northern War.

In January 1711, King Charles XII declared that Sweden would abandon the calendar, which was not in use by any other nation and had not achieved its objective, in favour of a return to the older Julian calendar. An extra day was added to February in the leap year of 1712, thus giving it a unique 30-day length.

In 1753, one year later than England and its colonies, Sweden introduced the Gregorian calendar, whereby the leap of 11 days was accomplished with February 17 being followed by March 1.

Mariah Carey (born March 27, 1970) is an American singer, songwriter, record producer, and actress. She made her recording debut in 1990 under the guidance of Columbia Records executive Tommy Mottola, and released her self-titled debut studio album, Mariah Carey. The album went multi-platinum and spawned four consecutive number one singles, on the U.S. Billboard Hot 100 chart. Following her marriage to Mottola in 1993, a series of hit records, including Emotions (1991), Music Box (1993) and Merry Christmas (1994), established her position as Columbia's highest-selling act. Daydream (1995), made music history when the second single, "One Sweet Day" a duet with Boyz II Men, spent a record sixteen weeks on top of the Billboard Hot 100, and remains the longest running number one song in US chart history. During the recording of the album Carey began to deviate from her pop background, and slowly traversed into R&B and Hip-hop. After her separation from Mottola, this musical change was evident with the release of Butterfly (1997).