It is possible to switch back to full date and time on each log line with "--log-dateformat 1". The short time-only format is default with the value of 0.
Log with short time-only format looks like:
[23:59:59] Accepted 389c47d1 Diff 1.16K/512 GPU 0 pool 0
[00:00:16] Log date is now 2013-12-22
[00:00:16] Stratum from pool 0 detected new block
[00:00:33] Accepted 7a4950a4 Diff 536/512 GPU 0 pool 0
Functions related to logging are extracted into dedicated source files
for better maintainability.
The existing low-level logging API is extended with a generalized scheme
providing log functions log_{error, warning, notice, info, debug} that
log messages based on a global opt_log_level.
opt_log_level for now is set to LOG_NOTICE and might be modified via
command line options or config files in future releases.