The last modified timestamp for zip/jar entries is TZ-lossy and may not serialize/deserialize across timezones to exactly the same unixtime. The unit test is only concerned with finding a plausible timestamp, not a perfectly accurate one. The +24hr/-24hr range is wide enough to cover all timezones.
Relax expected timestamp test to a 48hr range for zipfile entries due…
… to timezones
Excellent. Thank you!