Vasilica (name-day of holy Vasilij) denotes the orthodox new year and the traditional new year’s celebration among Macedonian and Serbian Roma. It is celebrated both by orthodox and Muslim Roma. Due to the use of the Julian calendar in orthodox countries all the way into the 20th century, Vasilica falls on the 14th of January and is therefore also called "old new year" (purano nevo berš) in distinction to the actual new year celebrated on the first of January.

Source and further reading:
ROMBASE © by Mozes F. Heinschink, Michael Teichmann 2003