Because in the Chinese Calendar, which is the Lunar Calendar, it is the New Year. The Lunar Calendar and Solar Calendar is different.
This year (2012) is 4649 in the Chinese calendar. Your meaning of the old Chinese calendar is unclear
1983 was the Year of the Pig in the Chinese Calendar.
Using the Chinese Calendar, 2007 is the year 4704.
Using the Chinese Calendar, 2007 is the year 4704.
The year 2007 was the year of the Boar/Pig on the Chinese calendar.
According to Chinese zodiac calendar 2010 is the Year of the Tiger.
The animal that represents the year 1948 in the Chinese calendar is the Rat.
1452, was the Chinese Year of the Monkey.
1951 was the Chinese Year of the Rabbit.
2007 was the last year of the pig on the Chinese Zodiac Calendar.
The Chinese lunar calendar does not use months, rather divisions. The Chinese lunar calendar has 24 divisions in a year.