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Given the characteristics of the three timestamps involved in file modification time checks in the cds system test (each one is an hour apart from the next), reduce the resolution of these checks to 1 minute. This will prevent intermittent false negatives caused by exceeding the currently allowed difference of 9 seconds between file modification times without making the test moot. Also note that by using abs(), checkmtime.pl allows the cds system test to pass when the modification time of the checked file is less than an hour (or two hours for the second check) in the past. This should never happen, so remove abs() from the condition checked by checkmtime.pl.
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