I tried

  urldate = {page consultée le},

in Overleaf but I'm getting this error

Package xkeyval Error: `urldate' undefined in families `blx@lbx'.

I'm using polyglossia and not babel. No inputenc nor UTF8. XeLaTeX.

OK, switched from urldate to urlseen and that fixed one issue. But once I used this:


It stopped working.

  • 1
    Can you make a compilable MWE? – samcarter_is_at_topanswers.xyz Mar 13 '17 at 13:02
  • 2
    Shouldn't it be urlseen instead of urldate? – David Purton Mar 13 '17 at 13:14
  • OK, I switched it to urlseen and it worked but once I added \DeclareFieldFormat{urldate}{%\thefield{urlday}\adddot\addspace%\mkbibmonth{\thefield{urlmonth}}\adddot\addspace%\thefield{urlyear}\isdot} to the preameble it's not working anymore. – Xyd Mar 13 '17 at 14:34

The correct string is urlseen and not urldate as can be seen from


so you need

  urlseen = {page consultée le},

For the date you probably want


together with the option urldate=long.

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