The following error message is logged in system log on NFS server in NG HA (Highly Available) NFS cluster:
ERROR: crm_abort: ha_set_tm_time: Triggered assert at iso8601.c:879 : rhs->tm_mday < 0 || lhs->days == rhs->tm_mday
This problem is not related to POA, it is the problem in the Linux package heartbeat-2.1.3. The issue may occur on leap years at the last day of month, actually it is warning which may be safely ignored as it does not affect any services.
The problem is fixed in the heartbeat-2.1.4.
Upgrade the heartbeat package to at least 2.1.4 on servers in NG HA NFS cluster.