in src/backend/utils/misc/tzparser.c
It uses 60 * 60 to represent SECS_PER_HOUR.
and It is already define in other files.
so I think using SECS_PER_HOUR is more clear for readability.
and I attached patch.(it just change 60 * 60 to SECS_PER_HOUR)
What do you think?