What is the important of dates?

Answer 1

The importance of radiometric dating is that it allows us to tell how old some things are. There are different methods of radiometric dating, and they apply to different things and they have different lengths of time, at least as regards the age of a sample, that they can speak to. For instance, in radiocarbon dating, there really isn't a way to date something to 100,000 years or more. It is only accurate to a period of time less than that. But with uranium-lead radiometric dating, certain rock samples can be dated back billions of years.

A link is provided to the Wikipedia article on radiometric dating to get you more information. If something is a bit fuzzy, come back to WikiAnswers and post more good questions like this one.

-IT CAN REVEAL THE ABSOLUTE AGE OF A FOSSIL-

Answer 2

Summary The expiry date is that point in time when a pharmaceutical product is no longer within acceptable specifications for potency and stability. In determining an expiry date, a range of characteristics of the product are studied over time. One important characteristic is the chemical stability of the active ingredient. Temperature has a pronounced effect on the rate of degradation of the active ingredient. As the rate of decomposition usually doubles for every 100C rise in temperature, it is important to comply with the storage conditions specified on the container. The expiry date may be set as a fixed time after manufacture, dispensing or opening of the manufacturer's container. It is good practice not to use drugs past their expiry date.