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Volley is a network library from Android source code.
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package com.android.volley;

import java.io.UnsupportedEncodingException;
import java.lang.ref.SoftReference;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.TimeZone;

/**
 * User: mcxiaoke
 * Date: 15/3/17
 * Time: 14:47
 */
public class InternalUtils {

    // http://stackoverflow.com/questions/9655181/convert-from-byte-array-to-hex-string-in-java
    private final static char[] HEX_CHARS = "0123456789ABCDEF".toCharArray();

    /**
     * Date format pattern used to parse HTTP date headers in RFC 1123 format.
     */
    public static final String PATTERN_RFC1123 = "EEE, dd MMM yyyy HH:mm:ss zzz";

    /**
     * Date format pattern used to parse HTTP date headers in RFC 1036 format.
     */
    public static final String PATTERN_RFC1036 = "EEE, dd-MMM-yy HH:mm:ss zzz";

    /**
     * Date format pattern used to parse HTTP date headers in ANSI C
     * {@code asctime()} format.
     */
    public static final String PATTERN_ASCTIME = "EEE MMM d HH:mm:ss yyyy";

    private static final String[] DEFAULT_PATTERNS = new String[]{
            PATTERN_RFC1123,
            PATTERN_RFC1036,
            PATTERN_ASCTIME
    };

    private static String convertToHex(byte[] bytes) {
        char[] hexChars = new char[bytes.length * 2];
        for (int j = 0; j < bytes.length; j++) {
            int v = bytes[j] & 0xFF;
            hexChars[j * 2] = HEX_CHARS[v >>> 4];
            hexChars[j * 2 + 1] = HEX_CHARS[v & 0x0F];
        }
        return new String(hexChars);
    }

    public static String sha1Hash(String text) {
        String hash = null;
        try {
            final MessageDigest digest = MessageDigest.getInstance("SHA-1");
            final byte[] bytes = text.getBytes("UTF-8");
            digest.update(bytes, 0, bytes.length);
            hash = convertToHex(digest.digest());
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return hash;
    }

    public static String formatDate(Date date) {
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:sss", Locale.US);
        return df.format(date);
    }

    public static Date parseDate(final String dateValue) {
        final String[] localDateFormats = DEFAULT_PATTERNS;
        final Date localStartDate = new Date();
        String v = dateValue;
        if (v.length() > 1 && v.startsWith("'") && v.endsWith("'")) {
            v = v.substring(1, v.length() - 1);
        }

        for (final String dateFormat : localDateFormats) {
            final SimpleDateFormat dateParser = DateFormatHolder.formatFor(dateFormat);
            dateParser.set2DigitYearStart(localStartDate);
            final ParsePosition pos = new ParsePosition(0);
            final Date result = dateParser.parse(v, pos);
            if (pos.getIndex() != 0) {
                return result;
            }
        }
        return null;
    }


    final static class DateFormatHolder {

        private static final ThreadLocal>>
                THREADLOCAL_FORMATS = new ThreadLocal>>() {

            @Override
            protected SoftReference> initialValue() {
                return new SoftReference>(
                        new HashMap());
            }

        };

        /**
         * creates a {@link SimpleDateFormat} for the requested format string.
         *
         * @param pattern
         *            a non-{@code null} format String according to
         *            {@link SimpleDateFormat}. The format is not checked against
         *            {@code null} since all paths go through
         * @return the requested format. This simple dateformat should not be used
         *         to {@link SimpleDateFormat#applyPattern(String) apply} to a
         *         different pattern.
         */
        public static SimpleDateFormat formatFor(final String pattern) {
            final SoftReference> ref = THREADLOCAL_FORMATS.get();
            Map formats = ref.get();
            if (formats == null) {
                formats = new HashMap<>();
                THREADLOCAL_FORMATS.set(new SoftReference<>(formats));
            }

            SimpleDateFormat format = formats.get(pattern);
            if (format == null) {
                format = new SimpleDateFormat(pattern, Locale.US);
                format.setTimeZone(TimeZone.getTimeZone("GMT"));
                formats.put(pattern, format);
            }

            return format;
        }

        public static void clearThreadLocal() {
            THREADLOCAL_FORMATS.remove();
        }

    }


}