Time stamp change

Hi All ,

I am trying to feed in the log from past date using GROK but the date picked in @timestamp is getting changed by some month & year offset.
Actual Date-2016-03-16 12:28:11AM
Time stamp in elasticsearch - "@timestamp": "2016-01-17T06:58:11.000Z",
Please let me know if I am missing something .
Config file grok part;-
grok {

        match => { "message" => "%{DATESTAMP:timestamp}" }
	date {
        match => [ "timestamp", "yy-MM-DD HH:mm:ss" ]


Use yy-MM-dd, not yy-MM-DD. Quoting the Joda-Time documentation:

y       year                         year          1996
D       day of year                  number        189
M       month of year                month         July; Jul; 07
d       day of month                 number        10

Thanks a lot. It worked perfectly.