old-style

adjective1

1. •
   In a now outdated style; old-fashioned.

   • One day our neighbours came back from a trip into the jungle to visit relatives who still lived in an old-style "long house". — 2005

noun2

1. •
   (historical) The Julian calendar system, especially with reference to Russia, where it continued to be used until the early 20th century.

   • As the [Manx] people reckon this festival according to the Old Style, Hollantide in the Isle of Man is our twelfth of November. — 1911
2. •
   (historical) A dating system in which March 25 is the New Year's Day.