MT4, MT5:
ESP35
December 31 – market closed
XBR
December 31 – early closing 19:45 UTC
AUS200
December 31 – early closing 03:30 UTC
UK100
December 31 – early closing 12:50 UTC
FRA40
December 31 – early closing 12:55 UTC
Crypto
January 1 – market opens 07:00 UTC