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    <p><strong>If</strong> you have the correct permission (see below), you can do this with the <code>AlarmManager</code>. For example, to set the time to 2013/08/15 12:34:56, you could do:</p> <pre><code>Calendar c = Calendar.getInstance(); c.set(2013, 8, 15, 12, 34, 56); AlarmManager am = (AlarmManager) this.getSystemService(Context.ALARM_SERVICE); am.setTime(c.getTimeInMillis()); </code></pre> <hr> <p>You need the permission <code>SET_TIME</code> to do this. Unfortunately, this is a <a href="http://developer.android.com/guide/topics/manifest/permission-element.html" rel="noreferrer"><code>signatureOrSystem</code></a> permission.</p> <p>Definition in <a href="http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/4.2.2_r1/frameworks/base/core/res/AndroidManifest.xml/" rel="noreferrer">AndroidManifest.xml:</a></p> <pre><code> &lt;!-- Allows applications to set the system time --&gt; &lt;permission android:name="android.permission.SET_TIME" android:protectionLevel="signature|system" android:label="@string/permlab_setTime" android:description="@string/permdesc_setTime" /&gt; </code></pre> <hr> <p>The only apps that can use this permission are:</p> <ul> <li>Signed with the system image</li> <li>Installed to the <code>/system/</code> folder</li> </ul> <p>Unless you build custom ROMs, you're out of luck with the first. </p> <p>For the second, it depends on what you are doing. </p> <ul> <li><p>If you're building an app for wide distribution (<a href="https://en.wikipedia.org/wiki/Google_Play" rel="noreferrer">Google Play</a>, etc.), you probably shouldn't. It's only an option for root users, and you'll only be able to install it manually. Any marketplace would not install it to the correct location.</p></li> <li><p>If you're building an app for yourself (or just as a learning exercise), go for it. You'll need a rooted phone, though, so do that first. You can then install the application straight to <code>/system/app/</code> with <a href="http://en.wikipedia.org/wiki/Android_Debug_Bridge" rel="noreferrer">ADB</a> or a file manager. See articles <a href="http://www.androidauthority.com/install-user-app-as-system-app-how-to-93522/" rel="noreferrer">like this</a> for more detail.</p></li> </ul> <hr> <p>One final note: The <code>SET_TIME</code> permission and <code>AlarmManager#setTime()</code> were added in Android 2.2 (<code>API 8</code>). If you're trying to do this on a previous version, I'm not sure it will work at all.</p>
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    1. POHow to set time to device programmatically
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    1. COI Always get an Exception saying: "java.lang.SecurityException: setTime: Neither user 10041 nor current process has android.permission.SET_TIME." I set the permission: "android.permission.SET_TIME" in my Manifest. Can anybody confirm that? @Geobits
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    2. COIs it installed as a system app?
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    3. COYou will always get this security exception because, even though you requested `android.permission.SET_TIME` in your manifest, the system **will not grant your app this permission unless it is a system app**. Basically, in short, unless you have a rooted phone or your own custom ROM you cannot set the time on the device. Period. End of story.
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