The following bug has been logged online:

Bug reference: 2664
Logged by: Yoshihisa Nakano
Email address: nakano.yosihisa@jp.fujitsu.com
PostgreSQL version: All
Operating system: All
Description: date_trunc('quarter', ...)
Details:

'quarter' is not mentioned in the doc as valid fields for date_trunc().

---------------------------(end of broadcast)---------------------------
TIP 5: don't forget to increase your free space map settings

"Yoshihisa Nakano" <nakano.yosihisa@jp.fujitsu.com> writes:
> 'quarter' is not mentioned in the doc as valid fields for date_trunc().

Fixed, thanks for the report!

regards, tom lane

---------------------------(end of broadcast)---------------------------
TIP 1: if posting/reading through Usenet, please send an appropriate
subscribe-nomail command to majordomo@postgresql.org so that your
message can get through to the mailing list cleanly