dateFormat.setCalendar(new GregorianCalendar());
        dateFormat.setTimeZone(DEFAULT_BUILD_TIME_ZONE);
        formattedTimestamp = dateFormat.format(time);
    }

    public String formattedTimestamp() {
        return formattedTimestamp;
    }

        MavenBuildTimestamp timestamp = new MavenBuildTimestamp(new Date(), interpolationProperties);
        String formattedTimestamp = timestamp.formattedTimestamp();
        assertTrue(formattedTimestamp.endsWith("Z"), "We expect the UTC marker at the end of the timestamp.");
    }

    @Override
    public Object getValue(String expression) {
        if ("build.timestamp".equals(expression) || "maven.build.timestamp".equals(expression)) {
            return new MavenBuildTimestamp(startTime, properties).formattedTimestamp();
        }
        return null;
    }