We have a 7.4.6 cluster which has been running on an HP B.11.00 box for quite sometime. The IT group applied daylight savings patches to the OS, but the cluster is still showing the incorrect timezone: $ psql -c "select now()" now ------------------------------- 2007-03-12 13:46:11.369583-05 $ date Mon Mar 12 14:46:18 EDT 2007 It appears that newly initialized 7.4.6 clusters get the proper timezone. I didn't see anything in the FAQ about restarting. Does this mean that we need to restart these clusters in order to get the timezone updates from the OS? Are they cached in the postmaster? TIA. Ed