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1960s 1970s 1980s
1970 Jan 1 March 1 April 26
 
June 15 July 15
 
Oct 1
 
Oct 25
 
1971 Jan 1  Feb 1 
Mar 15
April 25
July 1
Sept 15
Oct 31
1972 Jan 1
 
April 30
 
June 15
 
Oct 29
 
1973 Jan 1
April 29
June 1
July 15
Sept 1
Oct 28
1974 Jan 7

March 1
 
May 1
 
June 15
 
July 15
 
Oct 1
 
Oct 27
 
1975 Feb 23
 
April 27
 
Aug 15
 
Oct 26
 
1976 Jan 15
April 25
June 1
Aug 1
Oct 31
1977 Jan 1
 
April 24
 
June 15
 
Sept 1
 
Oct 30
 
1978 Jan 15
 
March 1
 
June 1
 
Aug 1
 
Sept 1
 
Oct 29
 
1979 Jan 15
 
April 1
 
April 29
 
Sept 1
 
Oct 28
 

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Updated September 22, 2024
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