Bydd y newidiadau hyn dechrau dod i rym o 4am ddydd Gwener 7 Ionawr. Caiff profion llif unffordd eu derbyn fel profion ar ôl cyrraedd o 4am ddydd Sul 9 Ionawr.
These changes will begin to come into force from 4am on Friday 7 January. Lateral flow tests will be accepted as post-arrival tests from 4am on Sunday 9 January.