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Accounting Utilities Manual

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The Clock Change Problem

Of the lasts I've tried, all of them have had problems parsing a system clock change. Instead of modifying the entries that have been read, they just ignore the change and give you incorrect values. GNU last knows about clock changes and prints the correct times.

TANGIBLE RESULT: if you diff the output of your last and GNU last, entries after (before, rather) a clock change will be off by the amount of the clock change.

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