The introduction of a new type of money in Europe, the euro, has been declared a success by the people responsible for it.
The European Commission say they are "extremely satisfied" with the euro on the first day most banks and shops have been open to take it.
Fact File
Euro facts
Greece and Ireland suffered the first euro robberies
Some UK shops including HMV and Hamleys will accept euros
All 2,700 cash machines in Austria stopped working briefly
All countries using the euro will stop using their old money by 28 February
But the new currency has not been a success everywhere.
New wallets needed for new money
In Greece people are buying new wallets and are trying to remember how to use coins.
That's because one Greek drachma is worth less than a penny, and most shops didn't take or give out coins.
Because the euro is worth more, around 60p, Greek people are now having to get used to coins all over again.
People have been very excited about the euro, with some even choosing to spend New Year's Eve queuing for the currency rather than celebrating the start of 2002.
Only three European Union countries have chosen not to use the new currency: UK, Denmark and Sweden.
