Apparently based on Mach absolute time, log entry times are converted to wallclock times. This exposes them to the vagaries of time zones, seasonal adjustments, and periodic wallclock adjustments. Here’s how all that works, and can confuse.
Consolation
Open multiple windows in LogUI, set them up to obtain the same log extract, then apply different searches to each. A powerful way to read long and complex log extracts.
How to construct and use filter predicates to refine the log entries shown in LogUI or most other log browsers, and in the log command tool.
Adds support for using your own filter predicates so you only see the log entries you want. Either in a one-off editor, or to its popup menu.
T2M2 is nearly 7 years old, and has already found at least two bugs in Time Machine. Here’s why it’s so hard to get it to work perfectly with each version of macOS.
How can you browse a logarchive sent from an iPhone, iPad, or someone else’s Mac? With Ulbow it’s really simple – and it can create logarchives too.
A revamped configuration profile to remove censored private data from log entries, and how to get network diagnostic data too.
Formed using reverse DNS notation, they can now have prefixes and suffixes giving them user and process identities. And how to find a list of them.
How Unified log entries are rich in structured information, which can be displayed selectively and using colours to aid their reading.
Time and timestamps, landmark events, activities like clicks, subsystems as predicates, Find, and bar charts – all aids to navigating the log.
The Eclectic Light Company 