Upvote:3
"20 DEC/DEC 20" means 20th December, 2020. The repetition is because the month name is given both in English (abbreviating "December") and French ("DΓ©cembre"). My own passport, for example, was issued on dd MAY/MAI yy (May/Mai) and expires on dd JUL/JUI yy (July/Juillet).
Upvote:5
If you're uncertain about the human-readable date, check the expiry field in the machine-readable zone, in which the format is standardized worldwide.
The date of expiry is in character positions 22 through 27 in the second line (immediately after the M
or F
that encodes your sex), in YYMMDD format.