January, February ......
January, February, March
15
February, March ......
April
15
March, April .....................
May
15
April, May .........
June
15
May, June .........
July
15
June, July ..............
August
15
July, August ....................
September
15
August, September .................
October
15
October, November ..........
December
15
February, March ......
April
15
March, April .....................
May
15
April, May .........
June
15
May, June .........
July
15
June, July ..............
August
15
July, August ....................
September
15
August, September .................
October
15
September, October .......
November
15
October, November ..........
December
15
January, February ......
January, February, March
15
September, October .......
November
15