Please remind me every year of Dad's birthday on September 21st.
[IN:CREATE_REMINDER Please remind [SL:PERSON_REMINDED me ] [SL:RECURRING_DATE_TIME [IN:GET_RECURRING_DATE_TIME [SL:FREQUENCY every year ] ] ] of [SL:TODO [IN:GET_TODO [SL:TODO Dad 's birthday ] [SL:DATE_TIME on September 21st ] ] ] . ]