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DateTimeOffset f(long msVal) {
TimeZoneInfo EST = TimeZoneInfo.GetSystemTimeZones().Where(x => x.Id == "Eastern Standard Time").SingleOrDefault() ?? TimeZoneInfo.FindSystemTimeZoneById("America/New_York");
var dt = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc).AddSeconds(msVal / 1000);
return TimeZoneInfo.ConvertTime(dt, EST);
}