diff --git a/package.json b/package.json
index e1e3fab..ed33534 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ssf",
-  "version": "0.5.11",
+  "version": "0.5.12",
   "author": "SheetJS",
   "description": "pure-JS library to format data using ECMA-376 spreadsheet Format Codes",
   "keywords": [ "format", "sprintf", "spreadsheet" ],
diff --git a/ssf.js b/ssf.js
index 7bc50cf..d11e341 100644
--- a/ssf.js
+++ b/ssf.js
@@ -5,7 +5,7 @@ var _strrev = function(x) { return String(x).split("").reverse().join("");};
 function fill(c,l) { return new Array(l+1).join(c); }
 function pad(v,d,c){var t=String(v);return t.length>=d?t:(fill(c||0,d-t.length)+t);}
 function rpad(v,d,c){var t=String(v);return t.length>=d?t:(t+fill(c||0,d-t.length));}
-SSF.version = '0.5.11';
+SSF.version = '0.5.12';
 /* Options */
 var opts_fmt = {};
 function fixopts(o){for(var y in opts_fmt) if(o[y]===undefined) o[y]=opts_fmt[y];}
@@ -120,6 +120,10 @@ var parse_date_code = function parse_date_code(v,opts) {
   var dout=[], out={D:date, T:time, u:86400*(v-date)-time}; fixopts(opts = (opts||{}));
   if(opts.date1904) date += 1462;
   if(date > 2958465) return null;
+  if(out.u > .999) {
+    out.u = 0;
+    ++time;
+  }
   if(date === 60) {dout = [1900,2,29]; dow=3;}
   else if(date === 0) {dout = [1900,1,0]; dow=6;}
   else {
diff --git a/ssf.md b/ssf.md
index ca973f4..acc9b8a 100644
--- a/ssf.md
+++ b/ssf.md
@@ -293,6 +293,15 @@ Date codes beyond 12/31/9999 are invalid:
   if(date > 2958465) return null;
 ```
 
+Due to floating point issues, correct for subseconds:
+
+```
+  if(out.u > .999) {
+    out.u = 0;
+    ++time;
+  }
+```
+
 Due to a bug in Lotus 1-2-3 which was propagated by Excel and other variants,
 the year 1900 is recognized as a leap year.  JS has no way of representing that
 abomination as a `Date`, so the easiest way is to store the data as a tuple.
@@ -1014,7 +1023,7 @@ coveralls:
 ```json>package.json
 {
   "name": "ssf",
-  "version": "0.5.11",
+  "version": "0.5.12",
   "author": "SheetJS",
   "description": "pure-JS library to format data using ECMA-376 spreadsheet Format Codes",
   "keywords": [ "format", "sprintf", "spreadsheet" ],