Other names: 30E/360 ISDA
Start date: M1/D1/Y1
End date: M2/D2/Y2
Day count = (Y2-Y1)*360+(M2-M1)*30+(D2-D1)
• if D1=31 then D1=30
• if D2=31 then D2=30
• if D1 is the last day of February then D1=30
• if D2 is the last day of February then D2=30
The last day of February is February 29 in leap years and February 28 in non leap years.
All methods of calculating the number of days between dates you can find in
Bond Calculator Guide.