I am trying to build the v1.0.9 of the project to make a hot fix for the issue LOGBACK-782 on my fork while v_1.0.10 is not released yet: git clone https://github.com/qos-ch/logback.git cd logback git checkout v_1.0.9 mvn clean test Im getting tests failures on the core module: testDay(ch.qos.logback.core.util.TimeUtilTest): expected:<1164078000000> but was:<1164074400000> testWeek(ch.qos.logback.core.util.TimeUtilTest): expected:<1164596400000> but was:<1164592800000> testMonth(ch.qos.logback.core.util.TimeUtilTest): expected:<1164942000000> but was:<1164938400000> testVaryingNumberOfDailyPeriods(ch.qos.logback.core.rolling.helper.RollingCalendarTest): p=13 expected:<1224381600000> but was:<1224385200000> If it is relevant, I am running the project on a mac If this is not a know issue and need more information, let me know Thanks, Bruno "Polaco"