Formula 1 bosses have opted to make no changes to the calendar for 2012, despite doubts regarding races in the United States of America and Bahrain.

The US organisers have been given a deadline of this week to raise the money to pay a sanctioning fee.

Meanwhile, safety concerns have been voiced over a race in Bahrain because of continuing civil unrest in the country.

Despite the issues, both countries have been handed a slot in the 20-race schedule, which begins in March.

F1 calender 2012:

Australia - Sunday, March 18
Malaysia - Sunday, March 25
China - Sunday, April 15
Bahrain - Sunday, April 22
Spain - Sunday, May 13
Monaco - Sunday, May 27
Canada - Sunday, June 10
Europe (Valencia)- Sunday, June 24
Great Britain - Sunday, July 8
Germany - Sunday, July 22
Hungary - Sunday, July 29
Belgium - Sunday, September 2
Italy - Sunday, September 9
Singapore - Sunday, September 23
Japan - Sunday, October 7
South Korea - Sunday, October 14
India - Sunday, October 28
Abu Dhabi - Sunday, November 4
United States - Sunday, November 18
Brazil - Sunday, November 25