On freeformatter.com/ you have many free online tools for developers. The tools contain converter, formatters, decryptors, validators and many more. It could be used for XML, HTML, SQL, JSON…
If you want to convert a Date to milliseconds or milliseconds to a Date in Java, there is a good website to do that: http://www.fileformat.info/tip/java/date2millis.htm
Don’t you like it to reinstall all your programs after a crash or Windows clean installation? Then your problem is now solved. On http://ninite.com, you can select all your software you want to install, get the installer and install all your programs in one single time.
Each country has its own phone number format. But what if you want a universal layout for all types of phone numbers? You can use Libphonenumber. With Libphonenumber, you can change phone layouts, create your own layouts, cast layouts and many more!