iothub/device/iot-device-client/src/main/java/com/microsoft/azure/sdk/iot/device/twin/ParserUtility.java [264:281]:
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    public static String dateTimeUtcToString(Date date) throws IllegalArgumentException
    {
        if (date == null)
        {
            throw new IllegalArgumentException("date cannot be null");
        }

        SimpleDateFormat dateFormat = new SimpleDateFormat(DATEFORMAT);
        dateFormat.setTimeZone(TimeZone.getTimeZone(TIMEZONE_UTC));
        StringBuilder dateStr = new StringBuilder();
        dateStr.append(dateFormat.format(date));
        dateStr.append(".");
        int milliseconds = (int)(date.getTime() % 1000L);
        milliseconds = milliseconds < 0 ? milliseconds + 1000 : milliseconds;
        dateStr.append(milliseconds);
        dateStr.append("Z");
        return dateStr.toString();
    }
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provisioning/provisioning-service-client/src/main/java/com/microsoft/azure/sdk/iot/provisioning/service/configs/ParserUtility.java [264:281]:
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    public static String dateTimeUtcToString(Date date) throws IllegalArgumentException
    {
        if (date == null)
        {
            throw new IllegalArgumentException("date cannot be null");
        }

        SimpleDateFormat dateFormat = new SimpleDateFormat(DATEFORMAT);
        dateFormat.setTimeZone(TimeZone.getTimeZone(TIMEZONE_UTC));
        StringBuilder dateStr = new StringBuilder();
        dateStr.append(dateFormat.format(date));
        dateStr.append(".");
        int milliseconds = (int)(date.getTime() % 1000L);
        milliseconds = milliseconds < 0 ? milliseconds + 1000 : milliseconds;
        dateStr.append(milliseconds);
        dateStr.append("Z");
        return dateStr.toString();
    }
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