var time = DateTime.ParseExact(object.Time.ToString(), "HHmm", CultureInfo.CurrentCulture).ToString("hh:mm tt");

var time = DateTime.ParseExact("17:00", "HH:mm", null).ToString("hh:mm tt");

var time = DateTime.ParseExact("17:00", "HH:mm", null).ToString("hh:mm tt", CultureInfo.GetCultureInfo("en-US"));

string s = DateTime.Today.Add(duration).ToString(specifier);

var time = DateTime.Now.ToString("h:mm tt", CultureInfo.InvariantCulture);

var dtUtc = DateTime.Now.ToUniversalTime();
dtUtc.AddHours(timeSpanObject.Hours);
dtUtc.AddMinutes(timeSpanObject.Minutes);

var dtLocal = dtUtc.ToLocalTime();

dtLocal.ToString("h:mm tt");