Are you eager to know how many days are left to attend your favorite concert? Do you want to know how many days have been passed since your last birthday? If so, then the built-in Windows Calculator ...

Amanda Smith is a freelance journalist and writer. She reports on culture, society, human interest and technology. Her stories hold a mirror to society, reflecting both its malaise and its beauty.

Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. Mira Norian / Investopedia A bank identification number (BIN) is the initial set of four to ...