Custom Date Sequence


I am calibrating a AUD curve which includes 90-day Bank Bill Futures.

90-day Bank Bill Futures expire on the Second Thursday of each quarter.

When creating an ImmutableIborFutureContractSpec to model up the future, how can I insert a custom DateSequence?

For example in the below I want to define QUARTERLY_SECONED_THURSDAY, which is not included in the StandardDateSequences class.

public static final IborFutureContractSpec AUD_BBSW_3M_IMM_ASX =

Thank you