Created Task list, then created first item in it with Due Date set for today. The item looks good. If I access it from browser it shows today date. If I access it via SSOM it also shows today 12AM date. But if I access it via CSOM it shows day before today and 9PM. CreatedBy field looks good anyway. So problem with only columns being updated with Calendar control. Same issue with all Date and Time columns on all sites. Site's Time Zone setting set to local Time Zone. Any ideas?