C# DateTime comparison: new DateTime(y,m,d) agaisnt a UTC DateTime date

 

public Observation[] GetBehaviourObservations()
        {
            var start = new DateTime(_year,1,1);
            var startDate = new DateTime(_year,1,1);
            var endDate = new DateTime(_year + 1,1,1);
            
            var observationList = new List<Observation>();
            var userProv = new UserProvider(_School);

            var organisations = new List<School> { _School };
            organisations.AddRange(_School.ChildOrganisations.Flatten(x => x.ChildOrganisations));

            foreach (var organisation in organisations)
            {
                using (var db = organisation.GetSchoolDc())
                {
                    var dbo = new DataLoadOptions();
                    dbo.LoadWith<CHR_Entry>(z=>z.CHR_Category);
                    dbo.LoadWith<CHR_Communication>(z=>z.CHR_CommunicationLogs);
                    db.LoadOptions = dbo;
                    db.ObjectTrackingEnabled = false;

                    var entriesData = db.CHR_Entries.Where(z => !z.Archived)
                        .Where(d=> d.CreatedTimestamp > start && d.CHR_Attendees.Any(a=>!a.Archived))
                        .Where(d=> d.CreatedTimestamp >= startDate &&
                                   d.CreatedTimestamp < endDate &&
                                   d.CHR_Attendees.Any(a=>!a.Archived))
                        .Select(d => new
                        {
                            Entry = d,

var start = new DateTime(_year,1,1); is server time.

d.CreatedTimestamp is UTC.

So what happens with .Where(d=> d.CreatedTimestamp > start && d.CHR_Attendees.Any(a=>!a.Archived))? Are we comparing against 2 different timezones?