Increase the price of taxi booking on a certain date
<p>I need help with the following problem:</p>

<p>I have a car hire service (written in PHP). The quote for the taxi hire is retrieved from the DB when users enter pick up and drop off point. Then they are navigated to the booking / reservation form. </p>

<p>I want to be able to increase the price of that quote based on a certain date range. For instance say Olympics time in London. If the customer choses that date range, I would like to increase the price by certain % or add a surcharge. </p>

<p>Any easy way to do this?</p>

<p>Thank you</p>
