HttpCachePolicy.SetLastModified

public void SetLastModified(DateTime date)
		{
			DateTime utcDate = DateTimeUtil.ConvertToUniversalTime(date);
			this.UtcSetLastModified(utcDate);
		}
		private void UtcSetLastModified(DateTime utcDate)
		{
			utcDate = new DateTime(utcDate.Ticks - utcDate.Ticks % 10000000L);
			if (utcDate > DateTime.UtcNow)
			{
				throw new ArgumentOutOfRangeException("utcDate");
			}
			if (!this._isLastModifiedSet || utcDate > this._utcLastModified)
			{
				this.Dirtied();
				this._utcLastModified = utcDate;
				this._isLastModifiedSet = true;
			}
		}