From eb06604fdc9d5ae612684add135983b21c6f3573 Mon Sep 17 00:00:00 2001
From: Allan Jardine <allan.jardine@sprymedia.co.uk>
Date: Mon, 19 Jan 2015 11:05:02 +0000
Subject: [PATCH] Sorting: Date time with moment.js - update to accept null and
 empty values, which are treated as -Infinity

---
 sorting/datetime-moment.js | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/sorting/datetime-moment.js b/sorting/datetime-moment.js
index e5fe738..0bb713b 100644
--- a/sorting/datetime-moment.js
+++ b/sorting/datetime-moment.js
@@ -27,6 +27,11 @@ $.fn.dataTable.moment = function ( format, locale ) {
 
 	// Add type detection
 	types.detect.unshift( function ( d ) {
+		// Null and empty values are acceptable
+		if ( d === '' || d === null ) {
+			return 'moment-'+format;
+		}
+
 		return moment( d, format, locale, true ).isValid() ?
 			'moment-'+format :
 			null;
@@ -34,7 +39,9 @@ $.fn.dataTable.moment = function ( format, locale ) {
 
 	// Add sorting method - use an integer for the sorting
 	types.order[ 'moment-'+format+'-pre' ] = function ( d ) {
-		return moment( d, format, locale, true ).unix();
+		return d === '' || d === null ?
+			-Infinity :
+			moment( d, format, locale, true ).unix();
 	};
 };