It's usually possible to tell when the error occurred because preceding and following events in the log will have valid timestamps, like this:
Code:
2021-3-17,8:47:26.0 2021-3-17,8:47:26.0 1 events critical 84000500 SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=;CMTS-MAC=00:01:5c:7a:a8:53;CM-QOS=1.1;CM-VER=3.0;
1970-1-1,0:1:36.0 1970-1-1,0:1:53.0 2 events warning 84020200 Lost MDD Timeout;CM-MAC=;CMTS-MAC=00:01:5c:7a:a8:53;CM-QOS=1.1;CM-VER=3.0;
1970-1-1,0:2:6.0 1970-1-1,0:2:6.0 1 events warning 68000401 ToD request sent - No Response received;CM-MAC=;CMTS-MAC=00:01:5c:7a:a8:53;CM-QOS=1.1;CM-VER=3.0;
2021-3-17,8:50:3.0 2021-3-17,8:50:3.0 1 events critical 68000900 TFTP file complete - but missing mandatory TLV;CM-MAC=;CMTS-MAC=00:01:5c:7a:a8:53;CM-QOS=1.1;CM-VER=3.0;