PROVISIONAL 2013 FORMULA 1 CALENDAR
17 March - Australia (Melbourne)
24 March - Malaysia (Sepang)
14 April - China (Shanghai)
21 April - Bahrain (Sakhir)
12 May - Spain (Barcelona)
26 May - Monaco
9 June - Canada (Montreal)
16 June - America (New Jersey) *
30 June - Britain (Silverstone)
21 July - Germany (Nurburgring/Hockenheim)
28 July - Hungary (Hungaroring)
1 September - Belgium (Spa-Francorchamps)
8 September - Italy (Monza)
22 September - Singapore (Marina Bay) *
6 October - Japan (Suzuka)
13 October - Korea (Yeongam) *
27 October - India (Buddh International)
3 November - Abu Dhabi (Yas Marina)
17 November - United States (Austin)
24 November - Brazil (Interlagos)
* Subject to confirmation
The question marks over New Jersey and Korea are serious.
F1 boss Bernie Ecclestone has himself expressed doubts that the New Jersey organisers will get the track, which features the Manhattan skyline as a backdrop, ready in time.
The second US race in Austin, Texas, which makes its debut this year on 18 November, is called the United States Grand Prix to differentiate the two events.
The Korean race, which made its debut in 2010, has long been shrouded in doubts because of financial issues.
There is also uncertainty over the venue of the German Grand Prix.
Next year is theoretically the turn of the Nurburgring in the deal with Hockenheim which sees the two tracks alternate as hosts.
But the Nurburgring is struggling with financial problems and it remains to be seen whether it will be able to host the race. If not, Hockenheim is expected to step in.
The schedule as listed is expected to be confirmed at a meeting of the FIA World Motorsport Council, effectively F1's legislative body, on 28 September.
Taken from BBC F1 website