Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> You could consider something along the lines of:
> This form specifies a transition that always happens during the same
> month and on the same day of the week. m identifies the month, from 1
> to 12. n specifies the n'th occurrence of the day number identified by
> d. n is a value between 1 and 4, or 5 meaning the last occurrence of
> that weekday in the month (which could be the fourth or the fifth). d
> is a value between 0 and 6, with 0 indicating Sunday.
Adopted with some minor tweaks. Thanks for the suggestion!
regards, tom lane