Hi All,
I can confirm that the Twitter Ads UI where you’re seeing this does not currently support any non-integral time zones like Asia/Kolkata +5:30.
I’m not aware of any reason for such restriction on the back-end in the Ads platform or an the Ads API but the Ads UI is currently restricting account creation with time zones like this. In any case, if it blocks you from creating an advertiser account with the correct timezone I can understand how that’s a problem for you.
For the time being though, these aren’t time zones we can support. I’ve looped in our product team to look at this and evaluate adding this support, but I obviously can’t make any promises or commit to any timelines.