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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

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

For more details, see our 30/360 Tutorials.

References:

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

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