Accept "+infinity" in date and timestamp[tz] input.
The float and numeric types accept this variant spelling of
"infinity", so it seems like the datetime types should too.
Vik Fearing, some cosmetic mods by me
Discussion: https://postgr.es/m/
d0bef637-2dbd-0a5d-e539-
48243b6f6c5e@postgresfriends.org