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package com.ksyun.ks3.utils;

import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;


public final class KSS4SignerUtils {

    private static final DateTimeFormatter dateFormatter = DateTimeFormat
            .forPattern("yyyyMMdd").withZoneUTC();

    private static final DateTimeFormatter timeFormatter = DateTimeFormat
            .forPattern("yyyyMMdd'T'HHmmss'Z'").withZoneUTC();

    /**
     * Returns a string representation of the given date time in yyyyMMdd
     * format. The date returned is in the UTC zone.
     *
     * For example, given a time "1416863450581", this method returns "20141124"
     */
    public static String formatDateStamp(long timeMilli) {
        return dateFormatter.print(timeMilli);
    }

    /**
     * Returns a string representation of the given date time in
     * yyyyMMdd'T'HHmmss'Z' format. The date returned is in the UTC zone.
     *
     * For example, given a time "1416863450581", this method returns
     * "20141124T211050Z"
     */
    public static String formatTimestamp(long timeMilli) {
        return timeFormatter.print(timeMilli);
    }
}