diff --git a/package.json b/package.json
index 0d5cc6f..ee62142 100644
--- a/package.json
+++ b/package.json
@@ -28,6 +28,7 @@
     "jst": "0.0.13",
     "marked": "^0.3.5",
     "minimist": "^1.2.0",
+    "moment": "^2.10.6",
     "underscore": "^1.8.3",
     "wkhtmltopdf": "^0.1.5",
     "xml-escape": "^1.0.0"
diff --git a/src/sheet.js b/src/sheet.js
index a305ba8..cfcb2b7 100644
--- a/src/sheet.js
+++ b/src/sheet.js
@@ -5,14 +5,18 @@ Abstract character/resume sheet representation.
 
 (function() {
 
-  var FS = require('fs');
-  var extend = require('./extend');
-  var validator = require('is-my-json-valid');
+  var FS = require('fs')
+    , extend = require('./extend')
+    , validator = require('is-my-json-valid')
+    , _ = require('underscore')
+    , moment = require('moment');
 
+  /**
+  Initialize a new Sheet instance.
+  */
   function Sheet() {
     this.id = null;
     this.title = "New";
-    this.rep = { };
     this.fileName = null;
   }
 
@@ -22,9 +26,12 @@ Abstract character/resume sheet representation.
   Sheet.prototype.open = function( file, title ) {
     var rep = JSON.parse( FS.readFileSync( file, 'utf8' ) );
     extend( true, this, rep );
-    console.log( this );
     this.fileName = file;
     this.title = title || this.basics.name;
+    _parseDates.call( this );
+    this.sort();
+    this.computed = this.computed || { };
+    this.computed.numYears = this.duration();
     return this;
   };
 
@@ -33,10 +40,22 @@ Abstract character/resume sheet representation.
   */
   Sheet.prototype.hasProfile = function( socialNetwork ) {
     socialNetwork = socialNetwork.trim().toLowerCase();
-    return this.basics.profiles && this.basics.profiles.filter(function(prof) {
+    return this.basics.profiles && _.some( this.basics.profiles, function(prof) {
       return prof.network.trim().toLowerCase() === socialNetwork;
-    }).length > 0;
-  }
+    });
+  };
+
+  /**
+  Determine if the sheet includes a specific skill.
+  */
+  Sheet.prototype.hasSkill = function( skill ) {
+    skill = skill.trim().toLowerCase();
+    return this.skills && _.some( this.skills, function(sk) {
+      return sk.keywords && _.some( sk.keywords, function(kw) {
+        return kw.trim().toLowerCase() === skill;
+      });
+    });
+  };
 
   /**
   Validate the sheet against a specific JSON schema.
@@ -46,8 +65,100 @@ Abstract character/resume sheet representation.
     var validator = require('is-my-json-valid')
     var validate = validator( schemaObj );
     return validate( this );
+  };
+
+  /**
+  Calculate the total duration of the sheet. Assumes this.work has been sorted
+  by start date descending.
+  */
+  Sheet.prototype.duration = function() {
+    var careerStart = _fmt( this.work[ this.work.length - 1].startDate );
+    var careerLast = _fmt( _.max( this.work, function( w ) {
+      return _fmt( w.endDate ).unix();
+    }).endDate );
+    return careerLast.diff( careerStart, 'years' );
+  };
+
+  /**
+  Sort dated things by start date descending.
+  */
+  Sheet.prototype.sort = function( ) {
+    var da, db;
+    if( this.work && this.work.length > 1 ) {
+      this.work.sort( function(a, b) {
+        return( a.safeStartDate.isBefore(b.safeStartDate) ) ? 1 : ( a.safeStartDate.isAfter(b.safeStartDate) && -1 ) || 0;
+      });
+    }
+    if( this.education && this.education.length > 1 ) {
+      this.education.sort( function(a, b) {
+        return( a.safeStartDate.isBefore(b.safeStartDate) ) ? 1 : ( a.safeStartDate.isAfter(b.safeStartDate) && -1 ) || 0;
+      });
+    }
+    if( this.volunteer && this.volunteer.length > 1 ) {
+      this.volunteer.sort( function(a, b) {
+        return( a.safeStartDate.isBefore(b.safeStartDate) ) ? 1 : ( a.safeStartDate.isAfter(b.safeStartDate) && -1 ) || 0;
+      });
+    }
+    if( this.awards && this.awards.length > 1 ) {
+      this.awards.sort( function(a, b) {
+        return( a.safeDate.isBefore(b.safeDate) ) ? 1 : ( a.safeDate.isAfter(b.safeDate) && -1 ) || 0;
+      });
+    }
+    if( this.publications && this.publications.length > 1 ) {
+      this.publications.sort( function(a, b) {
+        return( a.safeReleaseDate.isBefore(b.safeReleaseDate) ) ? 1 : ( a.safeReleaseDate.isAfter(b.safeReleaseDate) && -1 ) || 0;
+      });
+    }
+  };
+
+  /**
+  Format a human-friendly FluentCV date to a Moment.js-compatible date.
+  */
+  function _fmt( dt ) {
+    dt = dt.toLowerCase().trim();
+    if( dt === 'present' ) {
+      return moment();
+    }
+    else if( /^\D+/.test(dt) ) {
+      var parts = dt.split(' ');
+      return moment( parts[1] + '-' + (months[ parts[0] ] || abbr[ parts[0] ] || ( parts[0] === 'sept' && '09' )) + '-' + '01', 'YYYY-MM-DD' );
+    }
+    else {
+      var mt = moment( dt );
+      if(mt.isValid())
+        return mt;
+      throw 'Invalid date format encountered. Use YYYY-MM-DD.';
+    }
   }
 
+  function _parseDates() {
+    this.work.forEach( function(job) {
+      job.safeStartDate = _fmt( job.startDate );
+      job.safeEndDate = _fmt( job.endDate );
+    });
+    this.education.forEach( function(edu) {
+      edu.safeStartDate = _fmt( edu.startDate );
+      edu.safeEndDate = _fmt( edu.endDate );
+    });
+    this.volunteer.forEach( function(vol) {
+      vol.safeStartDate = _fmt( vol.startDate );
+      vol.safeEndDate = _fmt( vol.endDate );
+    });
+    this.awards.forEach( function(awd) {
+      awd.safeDate = _fmt( awd.date );
+    });
+    this.publications.forEach( function(pub) {
+      pub.safeReleaseDate = _fmt( pub.releaseDate );
+    });
+  }
+
+  var months = {}, abbr = {};
+  moment.months().forEach( function(m, idx) { months[ m.toLowerCase() ] = idx + 1; });
+  moment.monthsShort().forEach( function(m, idx) { abbr[ m.toLowerCase() ] = idx + 1; });
+
+  /**
+  Export the Sheet function/ctor.
+  */
   module.exports = Sheet;
 
 }());