in src/main/java/com/twitter/joauth/Verifier.java [160:165]
public boolean validateTimestampSecs(long timestampSecs) {
long nowSecs = System.currentTimeMillis() / 1000;
return (maxClockFloatBehindMins < 0 || (timestampSecs >= nowSecs - maxClockFloatBehindSecs)) &&
(maxClockFloatAheadMins < 0 || (timestampSecs <= nowSecs + maxClockFloatAheadSecs));
}