X10 Subfield $d - Date of meeting or treaty signing:

Subfield $d contains the date a meeting was held.

Examples:

110 2#$aCatholic Church.$bPlenary Council of Baltimore$n(2nd :$d1866)

110 2#$aInternational Labour Organisation.$bEuropean Regional Conference$n(2nd :$d1968:$cGeneva, Switzerland)

In a name/title X10 field, subfield $d also contains the date a treaty was signed.

Example:

710 1#$aAlgeria.$tTreaties, etc.$gEngland and Wales,$d1682 Apr. 20.