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//
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// DateUtils.m
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// MYUtilities
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//
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// Created by Jens Alfke on 3/25/08.
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// Copyright 2008 Jens Alfke. All rights reserved.
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//
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#import "DateUtils.h"
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#include <assert.h>
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#include <CoreServices/CoreServices.h>
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#include <mach/mach.h>
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#include <mach/mach_time.h>
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#include <unistd.h>
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/** Absolute time (since 'reference date') to NSDate. 0.0 -> nil. */
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NSDate* $date( CFAbsoluteTime time )
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{
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CAssert(time>=0.0 && time < 1.0e15, @"Bogus timestamp %g",time);
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return time ?[NSDate dateWithTimeIntervalSinceReferenceDate: time] :nil;
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}
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/** NSDate to absolute time (since 'reference date'). nil -> 0.0 */
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CFAbsoluteTime $time( NSDate* date )
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{
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return date ?[date timeIntervalSinceReferenceDate] :0.0;
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}
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NSTimeInterval TimeIntervalSinceBoot(void)
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{
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// Adapted from http://developer.apple.com/qa/qa2004/qa1398.html
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// Have to do some union tricks because AbsoluteToNanoseconds
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// works in terms of UnsignedWide, which is a structure rather
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// than a proper 64-bit integer.
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union {
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uint64_t asUInt64;
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UnsignedWide asUWide;
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} t;
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t.asUInt64 = mach_absolute_time();
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t.asUWide = AbsoluteToNanoseconds(t.asUWide);
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return t.asUInt64 / 1.0e9;
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}
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/*
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Copyright (c) 2008, Jens Alfke <jens@mooseyard.com>. All rights reserved.
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Redistribution and use in source and binary forms, with or without modification, are permitted
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provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this list of conditions
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and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice, this list of conditions
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and the following disclaimer in the documentation and/or other materials provided with the
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distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRI-
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BUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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