public static DateTime?ToUniversalTime(this DateTime?value)
{
if (!value.HasValue || value.Value.Kind == DateTimeKind.Utc)
{
return(value);
}
return(new DateTime?(DataTimeExtensions.ToUniversalTime(value.Value)));
}
public static DateTime Add(this DateTime time, TimeSpan timespan)
{
if (timespan == TimeSpan.Zero)
{
return(time);
}
if (timespan > TimeSpan.Zero && DateTime.MaxValue - time <= timespan)
{
return(DataTimeExtensions.GetMaxValue(time.Kind));
}
if (timespan < TimeSpan.Zero && DateTime.MinValue - time >= timespan)
{
return(DataTimeExtensions.GetMinValue(time.Kind));
}
return(time + timespan);
}
