1) The tool is mainly used for the online conversion of Epoch Unix timestamp to GMT and vice-versa.
2) The conversion can be carried out by selecting date,time, etc from list boxes and then clicking the "convert" button. The appropriate result will be printed in the text box shown.
3) The converter is useful in the programming world because it allows us to mathematically compare the date with other date or some other measure of time, such as hours, minutes, seconds.
4) Simple PHP tool allows user to use a programming algorithm to make decisions regarding GMT.