Question in the blog of structured streaming part 11

[bithw1]

Hi @phatak-dev
First, thank you very much for the great effort to write the structured streaming series.
I got a question: in http://blog.madhukaraphatak.com/introduction-to-spark-structured-streaming-part-11/

Running the Example
Enter the below records in socket console. These are records for AAPL with time stamps.

First Event
The first records is for time Wed, 27 Apr 2016 11:34:22 GMT.

1461756862000,"aapl",500.0
Spark outputs below results which indicates start of window

---

Batch: 0

+---------------------------------------------+----------+
|window |sum(value)|
+---------------------------------------------+----------+
|[2016-04-27 17:04:20.0,2016-04-27 17:04:30.0]|500.0 |
+---------------------------------------------+----------+

The first record is 2016-04-27 11:34:22, why in batch 0 the window interval is
2016-04-27 17:04:20.0,2016-04-27 17:04:30.0, I thought it should be around 2016-04-27 11:34:22,