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diff --git a/Source/SPDateAdditions.m b/Source/SPDateAdditions.m
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+++ b/Source/SPDateAdditions.m
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+//
+//  $Id$
+//
+//  SPDateAdditions.m
+//  sequel-pro
+//
+//  Created by Rowan Beentje (rowan.beent.je) on February 22, 2012
+//  Copyright (c) 2012 Rowan Beentje. All rights reserved.
+//
+//  Permission is hereby granted, free of charge, to any person
+//  obtaining a copy of this software and associated documentation
+//  files (the "Software"), to deal in the Software without
+//  restriction, including without limitation the rights to use,
+//  copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the
+//  Software is furnished to do so, subject to the following
+//  conditions:
+//
+//  The above copyright notice and this permission notice shall be
+//  included in all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+//  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+//  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+//  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+//  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+//  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+//  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+//  OTHER DEALINGS IN THE SOFTWARE.
+//
+//  More info at <http://code.google.com/p/sequel-pro/>
+
+#include <mach/mach_time.h>
+
+@implementation NSDate (SPDateAdditions)
+
+/**
+ * Retrieve a monotonic time for timing purposes: a value of a number of seconds
+ * which can be use for relative time comparison in a monotonic sense, eg in a 
+ * particular session this value will only ever increase linearly.
+ * This differs from (for example) unix epoch timestamps or dates, which can change
+ * when the system time changes or synchs, but should never be used for absolute time
+ * as it is based on the elapsed time since the system booted.
+ */
++ (double)monotonicTimeInterval
+{
+	uint64_t elapsedTime_t = mach_absolute_time();
+	Nanoseconds nanosecondsElapsed = AbsoluteToNanoseconds(*(AbsoluteTime *)&(elapsedTime_t));
+
+	return (((double)UnsignedWideToUInt64(nanosecondsElapsed)) * 1e-9);
+}
+
+@end