var timeZoneOffSet = await jsRuntime.InvokeAsync<int>("eval", "new Date().getTimezoneOffset()");

var ianaTimeZoneName = jsRuntime.Invoke<string>("eval",
    "(function(){try { return ''+ Intl.DateTimeFormat().resolvedOptions().timeZone; } catch(e) {} return 'UTC';}())");

  public async Task GetProfileDataAsync(ProfileDataRequestContext context)
        {
            var subjectId = context.Subject.GetSubjectId();
            var claimsForUser = await _usersService.GetUserClaimsBySubjectIdAsync(subjectId).Select(c => new Claim(c.ClaimType, c.ClaimValue)).ToList();
             context.AddRequestedClaims(claimsForUser );
        }