People are being reminded that the clocks go back at 2am on Sunday.
'Winter time' officially begins this weekend with the clocks going back by one hour.
At 2am, clocks will go back to 1am although most smartphones, tablets and computers will update automatically.
Winter time will end on Sunday March 29th 2020.
Earlier this year, MEPs voted to end the practice of adjusting clocks twice a year from 2021.