In many projects, we come across various utility methods e.g.

Email validation
Convert from dd/mm/yyyy to mm/dd/yyyy or other date formats
etc.

I would like to knoe as what are the varoius common utility method that we genrally use?

I know that some methods are project specific but many will be common. I searched in net to get a list of as much as possible but none I found to be very informative.

Could you please help?

Thanks