我希望能够从现有的NSDate中移除两分钟。这就是代码的样子：
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<meta name="description" content="Welcome to my personal web site (web presentation). My name is Aleksandar Mitrović. I am frontend developer from Belgrade, Serbia.
I am interested in web development. My occupation is Professional Electrical and Computer Engineer.">
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<li><a href="#aboutMe">About us</a></li>
<li><a href="#portfolio">Portfolio</a></li>
<li><a href="#experience">Skills & Experience</a></li>
<li><a href="#contact">Contact</a></li>
</ul>
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</nav>
<div class="hero" id="hero">
<div class="container-fluid">
<video autoplay loop class="hero-video" poster="img/hero.jpg">
<source src="video/Hello-World.mp4" type="video/mp4" />Your browser does not support the video tag. I suggest you upgrade your browser.
<source src="video/Hello-World.webm" type="video/webm" />Your browser does not support the video tag. I suggest you upgrade your browser.
</video>
<div class="row">
<div class="hero-content animated fadeIn">
<h1 class="hero-content-title">Welcome to my web presentation</h1>
<h2 class="hero-content-subTitle">My name is Aleksandar Mitrović, I'm a <span>frontend developer</span> living in Belgrade, Serbia.</h2>
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<a href="#aboutMe" class="hero-scroll animated fadeIn">
<i class="fa fa-angle-double-down fa-2x bounce" aria-hidden="true"></i>
Scroll down
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</div>
<section id="aboutMe" class="aboutMe">
<div class="container">
<div class="row">
<div class="sectionTitle">
About me
</div>
</div>
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<img src="http://s7.postimg.org/54pch8kyz/image.jpg">
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<div class="aboutMe-content">
<p>I am a student of final year school of electrical engineering and computer science of applied studies in Belgrade, majoring in new computer technology.</p>
<p>Occupation: Professional Electrical and Computer Engineer.</p>
<p>I finished middle electrical school in Belgrade.</p>
<p>I am a person with adventurous spirit and trips for me represent a kind of hobby.</p>
<p>Besides programming I have a great interest for history and social sciences.</p>
<p>In my free time I prefer drawing.</p>
<p>Knowledge of English and German language.</p>
<p>Active driver B category.</p>
</div>
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</div>
</section>
<section class="portfolio" id="portfolio">
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<div class="sectionTitle sectionTitle-color--white">
Portfolio
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<a href="http://sf1group.staging.creitiveapps.com/sr" target="_blank">
<div class="col-sm-4 portfolio-article">
<img src="img/sf1group.png">
<div class="portfolio-article-title">
SF1 Group
</div>
</div>
</a>
<a href="http://www.gradjevinar.rs/sr" target="_blank">
<div class="col-sm-4 portfolio-article">
<img src="img/gradjevinar.png">
<div class="portfolio-article-title">
Gradjevinar
</div>
</div>
</a>
<a href="http://globtour.staging.creitiveapps.com/hr" target="_blank">
<div class="col-sm-4 portfolio-article">
<img src="img/globtour.png">
<div class="portfolio-article-title">
Globtour
</div>
</div>
</a>
<a href="http://jadranekspres.staging.creitiveapps.com/en" target="_blank">
<div class="col-sm-4 portfolio-article">
<img src="img/jadranekspres.png">
<div class="portfolio-article-title">
Jadranekspres
</div>
</div>
</a>
<a href="#portfolio">
<div class="col-sm-4 portfolio-article">
<img src="http://www.snopes.com/wordpress/wp-content/uploads/2016/04/the-farm-below-the-mountain.jpg">
<div class="portfolio-article-title">
</div>
</div>
</a>
<a href="#portfolio">
<div class="col-sm-4 portfolio-article">
<img src="http://images.8tracks.com/cover/i/000/933/114/44813.original-6904.jpg?rect=128,0,768,768&q=98&fm=jpg&fit=max">
<div class="portfolio-article-title">
</div>
</div>
</a>
</div>
</div>
</section>
<section class="experience" id="experience">
<div class="sectionTitle">
Skills & Experience
</div>
<div class="container">
<div class="row">
<div class="col-xs-6 col-sm-4 col-md-2 experience-skill">
<div id="skill1" class="experience-skill-circle"></div>
<h2 class="experience-skill-title">Html5 / Bootstrap</h2>
</div>
<div class="col-xs-6 col-sm-4 col-md-2 experience-skill">
<div id="skill2" class="experience-skill-circle"></div>
<h2 class="experience-skill-title">Css3 / Sass</h2>
</div>
<div class="col-xs-6 col-sm-4 col-md-2 experience-skill">
<div id="skill3" class="experience-skill-circle"></div>
<h2 class="experience-skill-title">Javascript / Jquery</h2>
</div>
<div class="col-xs-6 col-sm-4 col-md-2 experience-skill">
<div id="skill4" class="experience-skill-circle"></div>
<h2 class="experience-skill-title">Php / Mysql</h2>
</div>
<div class="col-xs-6 col-sm-4 col-md-2 experience-skill">
<div id="skill5" class="experience-skill-circle"></div>
<h2 class="experience-skill-title">Wordpress</h2>
</div>
<div class="col-xs-6 col-sm-4 col-md-2 experience-skill">
<div id="skill6" class="experience-skill-circle"></div>
<h2 class="experience-skill-title">Photoshop</h2>
</div>
</div>
<div class="row">
<div class="col-sm-6 col-sm-offset-3 experience-content">
<h1>Internship for Frontend developer ( 4 months )</h1>
<p>I had internship for frontend developer in digital agency "Creitive" in Belgrade.</p>
<p>On internship i was working with:</p>
<ul>
<li>-HTML5 ( BOOTSTRAP ) / CSS3 ( SASS, COMPASS, BEM Methodology )</li>
<br>
<li>-JAVASCRIPT (JQUERY)</li>
<br>
<li>-PHP</li>
</ul>
<p>Framework i was working with:</p>
<ul>
<li>-PHP FRAMEWORK LARAVEL</li>
</ul>
<p>OS i was working with:</p>
<ul>
<li>-LINUX</li>
</ul>
<p>Version control system i was working with:</p>
<ul>
<li>-GIT</li>
</ul>
</div>
</div>
</div>
</section>
<section class="contact" id="contact">
<div class="container">
<div class="row">
<div class="sectionTitle">
Contact
</div>
</div>
<div id="map" class="col-sm-12"></div>
<div class="row">
<div class="contact-info">
<a href="tel:+381656761810" class="contact-info-link">
<i class="fa fa-mobile" aria-hidden="true"></i> +381 65 6761 810
</a>
<a href="mailto:coaone93@gmail.com" class="contact-info-link">
<i class="fa fa-envelope" aria-hidden="true"></i> coaone93@gmail.com
</a>
</div>
<form name="contactform" method="post" action="send_form_email.php" class="form" id="forms">
<div class="col-sm-6">
<label for="name">Full name</label>
<input type="text" id="name" name="name" maxlength="50" size="50px" min="5" required>
<label for="email">Email</label>
<input type="email" id="email" name="email" required>
<label for="phone">Phone</label>
<input type="number" id="phone" name="phone" size="50">
</div>
<div class="col-sm-6 ">
<label for="comment">Comment</label>
<textarea id="comment" name="comment" minlength="5" maxlength="1000" cols="25" required></textarea>
<input type="submit" value="Send" class="btn btn-contact">
</div>
</form>
</div>
</div>
</section>
<footer>
<div class="container">
<div class="row">
<div class="footer-logo">
<a href="#hero"><img src="img/logo.png" width="110" height="23"></a>
</div>
</div>
<div class="row">
<div class="footer-social">
<a href="https://www.facebook.com/tadija.stefanovic.5" target="_blank"><i class="fa fa-facebook" aria-hidden="true"></i></a>
<a href="https://www.linkedin.com/in/aleksandar-mitrovic-155590b6?trk=nav_responsive_tab_profile_pic" target="_blank"><i class="fa fa-linkedin" aria-hidden="true"></i></a>
</div>
</div>
<div class="row">
<div class="footer-credits">
Copyright 2016 Aleksandar Mitrović
</div>
</div>
</div>
</div>
</footer>
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<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.2/jquery.min.js"></script>
<!-- Script for circles percents on section skills & experiences -->
<script src="js/circlePercentProgress.js"></script>
<!-- End of script for circles percents on section skills & experiences -->
<!-- Script for options of circles percents on section skills & experiences -->
<script src="js/circlePercentProgressOptions.js"></script>
<!-- End of script for options for circles percents on section skills & experiences -->
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script src="js/bootstrap.min.js"></script>
</body>
这两张照片给了我这个：
timeForLocalPush = defaults.objectForKey("timeForLocalPush") as! String
//Add the extra zero so the dateformatter :ss will match, remove 2 minutes from the time and set the fire date to it!
timeForLocalPush = timeForLocalPush + " " + self.timePicked + ":00"
print(timeForLocalPush)
let formatter = NSDateFormatter()
formatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
let calendar = NSCalendar.currentCalendar()
let newDate = calendar.dateByAddingUnit(.Minute, value: -2, toDate: formatter.dateFromString(timeForLocalPush)!, options: [])
print(newDate!)
这是两分钟还是两个小时？