467 	if(opts && opts.date1904) date += 1462;
494 function datenum_local(v/*:Date*/, date1904/*:?boolean*/)/*:number*/ {  argument
496 	if(date1904) epoch -= 1461*24*60*60*1000;
557 			if(v instanceof Date) return SSF_format(14, datenum_local(v, opts && opts.date1904), opts);
1245 	if(v instanceof Date) v = datenum_local(v, o.date1904);
3340 function datenum(v/*:Date*/, date1904/*:?boolean*/)/*:number*/ {  argument
3342 	if(date1904) epoch -= 1462*24*60*60*1000;
4431 					if(o.cellDates) { cell.t = 'd'; cell.w = SSF_format(cell.z, datenum(cell.v, o.date1904)); }
4432 …		else { cell.t = 'n'; cell.v = datenum(cell.v, o.date1904); cell.w = SSF_format(cell.z, cell.v); }
8081 					if(d1904 >= 1 && d1904 <= 4) wb.Workbook.WBProps.date1904 = true;
8114 …ext_cell_format) && opts.cellDates) { val = numdate(wb.Workbook.WBProps.date1904 ? val + 1462 : va…
8117 						if(!opts.cellDates) { cell_t = "n"; val = datenum(val, wb.Workbook.WBProps.date1904); }
8140 …at) arr[R][C].w = SSF_format(arr[R][C].z, arr[R][C].v, { date1904: wb.Workbook.WBProps.date1904 });
8205 		var _opts = dup(opts); _opts.date1904 = (((wb||{}).Workbook || {}).WBProps || {}).date1904;
8257 		var d1904 = (((wb||{}).Workbook||{}).WBProps||{}).date1904;
8272 				p.push(write_ws_cell_sylk(cell, ws, R, C, opts)); // TODO: pass date1904 info
17088 	['date1904',                    false, "bool"],
17186 	_ssfopts.date1904 = parsexmlbool(wb.WBProps.date1904);
17190 	/* TODO: store date1904 somewhere else */
17193 	return parsexmlbool(wb.Workbook.WBProps.date1904) ? "true" : "false";
17511 	o.date1904 = !!(flags & 0x01);
17530 		if(data.date1904) flags |= 0x01;
18115 	var Workbook/*:WBWBProps*/ = ({ Sheets:[], WBProps:{date1904:false} }/*:any*/), wsprops = {};  property in Workbook.WBProps
18425 					case 'date1904' /*case 'Date1904'*/:
18427 						Workbook.WBProps.date1904 = true;
18841 …if((((wb||{}).Workbook||{}).WBProps||{}).date1904) return '<ExcelWorkbook xmlns="urn:schemas-micro…
19216 function safe_format_xf(p/*:any*/, opts/*:ParseOpts*/, date1904/*:?boolean*/) {  argument
19233 		else p.w = SSF_format(fmtid,p.v, {date1904:!!date1904, dateNF: opts && opts.dateNF});
19263 …var Workbook/*:WBWBProps*/ = ({ Sheets:[], WBProps:{date1904:false}, Views:[{}] }/*:any*/), wsprop…  property in Workbook.WBProps
19373 					wb.opts.Date1904 = Workbook.WBProps.date1904 = val; break;
22230 							if(!opts.cellDates) { q.t = 'n'; q.v = datenum(q.v, WB.WBProps.date1904) - baddate; }
22425 					case "1904-01-01": WB.WBProps.date1904 = true;
23059 …if(((wb.Workbook||{}).WBProps||{}).date1904) o.push('      <table:calculation-settings table:case-…