blob_appendf(&json, "\"mtime\":\"%.10sT%sZ\",", zDate, zDate+11);
    if( zLMtime && zLMtime[0] ){
      blob_appendf(&json, "\"lmtime\":%!j,", zLMtime);
    }
    blob_append(&json, "\"xfrom\":", -1);
    if(zFrom){
      blob_appendf(&json, "%!j,", zFrom);
      isWiki = fossil_strcmp(zFrom, zChatUser)==0;
    }else{
      /* see https://fossil-scm.org/forum/forumpost/e0be0eeb4c */
      blob_appendf(&json, "null,");
      isWiki = 0;
    }
    blob_appendf(&json, "\"uclr\":%!j,",
                 user_color(zFrom ? zFrom : "nobody"));