public static void start() {
        if (!SystemPropertyUtils.isEnablePeriod()) {
            return;
        }
        Period period = new Period();
        period.start = SystemClock.now();
        TL.set(period);
    }
@author Robert HG (254963746@qq.com) on 11/1/16.
lts-core/src/main/java/com/github/ltsopensource/core/commons/utils/PeriodUtils.java