final AtomicLong ts1 = new AtomicLong(1466503200L);
final AtomicLong ts2 = new AtomicLong(1466593200L);
final AtomicInteger count = new AtomicInteger(1);

final Supplier<HashMap<String, Object>> data2 = () -> new HashMap<String, Object>() {{
        put("DATETIME", count.get() % 10 == 0 ? ts2.get() : ts1.get());
        put("COL1", "abc-" + count.get());
        put("COL2", "abd-" + count.get());
        put("ZCOL0", "zero-" + count.get());
        put("COL3", "bbb-" + count.getAndAdd(1));
    }};