date -d 'AAAA-MM-JJ' '+%s'
. Exemple : date -d '2019-01-01' '+%s'
;sudo apt-get install sqlite3
;sqlite3 ~/.local/share/gajim/logs.db .dump > sauvegarde_conversations_gajim.sql
;Nettoyer la base de données des conversations Gajim :
$ sqlite3 ~/.local/share/gajim/logs.db
sqlite> DELETE FROM logs WHERE time < <TIMESTAMP_OBTENU_À_LA_PREMIÈRE_ÉTAPE> ;
sqlite> DELETE FROM unread_messages WHERE message_id NOT IN (SELECT DISTINCT(log_line_id) FROM logs) ;
sqlite> VACUUM ;
sqlite> .exit