Hi Nakul_Bhagat
checking this setting from your last screenshot, I see the same as you...
(UTC-03:00) Brasilia
There are no upcoming Daylight Saving Time Changes
However when doing tests in programs which uses calendar, we still see 1 hour time difference when using calendar in some programs during the period on which DST was supposed to be active this year.
Then once more I opened the TZEdit tool, to check and again using the tool we still see the DST enabled.
Technically I don't know from where in the OS settings, both the calendar programs and TZEdit tool are taking this info...
But since there are 2 different programs bringing the same DST information (that DST will start) and which is different from what the OS is showing, I believe that this is stored in some common place in the OS.
And as I've already informed before, If I use the TZEdit tool to inform that DST is not observed and save the change, the problem is fixed.
I know that this is not a Microsoft tool, however I think that yous guys can download and use it also, in order to confirm this behavior and to get more details about what could be happening.