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Day Count Convention: 30/360

Aliases: 30/360, 360/360, Bond Basis, 30/360 Bond Basis, 30A/360, 30/360 ISDA, 30/360 U.S. Municipal, 30/360 American Basic Rule, D30/360 ISDA, 30/360 Bond, US ISMA, 30U/360

Usage: US corporate and municipal bonds prior to 1960s

Rules:

T1 = (Y1,M1,D1): Starting date (inclusive)  
T2 = (Y2,M2,D2): Ending date (exclusive)

Day_Count_Factor(Y1,M1,D1,Y2,M2,D2)
   = DiR(Y1,M1,D1,Y2,M2,D2) / DiY(Y1,M1,D1,Y2,M2,D2)

DiR(Y1,M1,D1,Y2,M2,D2) = 360×(Y2-Y1) + 30×(M2-M1) + (D2-D1)
  where D1 and D2 are adjusted as below:
    If D1 = 31, set D1 = 30;
    If D2 = 31 and D1 > 29, set D2 = 30.

DiY(Y1,M1,D1,Y2,M2,D2) = 360

References:

• 2006 ISDA Definitions by ISDA: 30/360, 360/360, Bond Basis
• Day count convention by Wikipedia: 30/360 Bond Basis, 30A/360
• Day Counts by OpenGamma: 30/360 ISDA, 30/360 U.S. Municipal
• Bond Calculator - Day Count Conventions by Cbonds: 30/360 ISDA, 30/360, Bond Basis, 30/360 U.S. Municipal
• Method of Interest Computation Indicator by ISO 20022: 30/360 ISDA, 30/360 American Basic Rule
• (Day count) Basis by Cbonds: 30/360 ISDA
• Day Count Conventions by Treasury Systems: D30/360 ISDA, Bond Basis
• Name - convention for couting days by Deriscope: 30/360 Bond, US ISMA
• Day count convention by Grokipedia: 30/360 Bond Basis
• Day Count Conventions by Eclipse: 30U/360
• MSRB Rule Book for the Municipal Market: Rule G-33 by MSRB: Day Count Formula

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