add_date_int add_interval_interval add_timestamptz_interval bool_in bool_out cstring2text date_in date_out date_to_timestamp date_to_timestamptz float_exp float_ln float_log10 float_round interval_cmp interval_in interval_make interval_out minus_date_date minus_date_int minus_timestamptz_interval minus_timestamptz_timestamptz mul_interval_double text2cstring text_cmp text_copy text_initcap text_lower text_out text_upper textcat_text_text time_in time_out timestamp_in timestamp_out timestamp_to_date timestamptz_in timestamptz_out timestamptz_shift timestamptz_to_date

minus_timestamptz_timestamptz() Interval * minus_timestamptz_timestamptz ( TimestampTz  t1, TimestampTz  t2  ) Return the subtraction of two timestamptz values. Parameters [in] t1,t2 Timestamps Note PostgreSQL function: timestamp_mi(PG_FUNCTION_ARGS). Notice that the original code from PostgreSQL has Timestamp as arguments