Github user JonZeolla commented on a diff in the pull request:

    https://github.com/apache/metron/pull/692#discussion_r132855925
  
    --- Diff: 
metron-stellar/stellar-common/src/main/java/org/apache/metron/stellar/common/utils/EpochUtils.java
 ---
    @@ -0,0 +1,44 @@
    +/**
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
    + * "License"); you may not use this file except in compliance
    + * with the License.  You may obtain a copy of the License at
    + *
    + *     http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +
    +package org.apache.metron.stellar.common.utils;
    +
    +/**
    + * Utility functions for working with numbers that represent different
    + * formats of EPOCH time.
    + */
    +public class EpochUtils {
    +
    +  /**
    +   * Ensures returns the passed value as milliseconds from EPOCH if the 
value is in seconds.
    +   * This is done by looking at the number of digits.
    +   * If there are 10, then the value is concidered to be in seconds and 
will by
    +   * muliplited by 1000.
    +   * If there not 10, then the original value will be returned.
    +   *
    +   *
    +   * </p>
    +   * @param canidate The Long value to concider
    +   * @return A Long value
    +   */
    +  public static Long ensureEpochMillis(Long canidate) {
    +    int length = (int)Math.floor(Math.log10(canidate) + 1);
    +    return length == 10 ? canidate * 1000 : canidate;
    --- End diff --
    
    We should handle inputs of length 1-9 as well.


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