On the night between Saturday, April 29, and Sunday, April 30, 3:00 AM will become 4: AM. The summer hour in Romania is correlated with the one in the European Union, at 3 hours distance from GMT, changing in the last Sunday of March and the last Sunday in October.

The convention is applied in Romania since 1979 for the summer months, when the sun rises at 4:30 AM and sets at 20:00H, so that natural light would be used at its optimum and electricity would be spared.

Initially, the idea of changing the time during the summer belonged to Benjamin Franklin, who wrote in 1784 An Economical Project suggesting that people should get up earlier and use the sunlight, instead of using oil lamps.