positions api error

Hi Anton,
I have two devices both are using protocol gt06. When I tries to get position details, I got for one device

http://<my server ip>:8082/api/positions?deviceId=1&from=2018-06-06T03:16:00.000Z&to=2018-06-06T03:50:17.194Z

but for the second device I use its deviceId, there is no results got and no errors just blank json

http://<my server ip>:8082/api/positions?deviceId=4&from=2018-06-06T03:16:00.000Z&to=2018-06-06T03:50:17.194Z

whereas in database in between those time interval records are stored.

I cant understand whats the problem,
Please suggest something.

Thank you

Are you sure you are using correct timezone?

Can you tell me how can I check my device timezone?
Using ST# command I got timezone as GMT:E8

What I meant is that in the database you probably see local time, but in your API request you are using UTC.

may be I am wrong using the time format
for example in server, the server time is like this
2018-06-06 12:40:34

so in my API request I used to call like this
2018-06-06T12:40:34.000Z

is this right?

No, it's not. I think you show read about ISO format.