Therefore, you'll have the best results when you can specify a range of possible dates, and you'll do even better if you offer alternate departure airports or destinations. (wisebread.com)
Some maintain a relatively fixed asset allocation through time, while others are actively managed and specify ranges for asset categories that can be broad, implementing changes based upon forecasts. (aaii.com)
If this isn't enough, you also have to option to specify a range of dates, or the physical location the post was made from. (howtogeek.com)