Thirty360 US (NASD) DayCounter convention.

If the starting date is the 31st of a month, it becomes equal to the 30th of the same month.

If the ending date is the 31st of a month and the starting date is earlier than the 30th of a month, the ending date becomes equal to the 1st of the next month, otherwise the ending date becomes equal to the 30th of the same month.

Also known as '30/360', '360/360', or 'Bond Basis'.

String CTDayCountEnums.DCThirty360()

=CT.DC.Thirty360.US()

static std::string DCThirty360();

System.String CTDayCountEnums.DCThirty360();