Time filter difference in different region

I have some dashboard which using time filtering on Grafana version 7.0.3.
I am from HK, when I choose 1Jan2022 to 28Feb2022, it can retrieve data correctly on this period.
But my teammate in India have they same choice and it result data difference, I used the variable $__timeTo() and find that it will retrieve one more day i.e. 1Jan2022 to 1Mar2022. Any idea why and how to fix it? Thx.