Send date time to elasticsearch from php

Elastic Stack Elasticsearch
1

I am sending json data from php to elasticsearch. My Json object has a field named as date which contains date time.
[{"date":"2018-05-15 00:00:01", "reading" : 0},
{"date":"2018-05-15 02:00:00", "reading" : 50},
{"date":"2018-05-15 04:00:00", "reading" : 110},
{"date":"2018-05-15 06:00:00", "reading" : 176},
{"date":"2018-05-15 08:00:00", "reading" : 200}]

The data is getting added successfully to elasticsearch, but "date" goes in string format and not in datetime format. I also converted the date in date time format using php function, still not working.
Please help.

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