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POGetting GMT time with Android
 

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    <p>I have been digging into the question for a while in StackOverflow <a href="https://stackoverflow.com/questions/2818086/android-get-current-utc-time">Android get Current UTC time</a> and <a href="https://stackoverflow.com/questions/308683/how-can-i-get-the-current-date-and-time-in-utc-or-gmt-in-java">How can I get the current date and time in UTC or GMT in Java?</a></p> <p>I have tried two ways to get the current time of my phone in GMT. I am in Spain and the difference is GMT+2. So let's see with an example: 1º attemp: I created a format and applied it to System.currentTimeMillis();</p> <pre><code> DateFormat dfgmt = new java.text.SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); dfgmt.setTimeZone(TimeZone.getTimeZone("GMT")); String gmtTime = dfgmt.format(new Date()); //Using System.currentTimeMillis() is the same as new Date() Date dPhoneTime = dfgmt.parse(gmtTime); Long phoneTimeUTC = dPhoneTime.getTime(); </code></pre> <p>I need to substract that time to another time, that's why i do the cast to Long.</p> <pre><code> DateFormat df = new java.text.SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); Date arrivalDate = df.parse(item.getArrivalDate()); //the String comes from JSON and is for example:"UTC_arrival":"2011-05-16 18:00:00" //which already is in UTC format. So the DateFormat doesnt have the GMT paramater as dfgmt diff = arrival.getTime() - phoneTimeUTC ; </code></pre> <p>I also tried this:</p> <pre><code> Calendar aGMTCalendar = Calendar.getInstance(TimeZone.getTimeZone("GMT")); Long phoneTimeUTC = aGMTCalendar.getTimeInMillis() </code></pre> <p>And still I dont get the right difference. But if I do this:</p> <pre><code> Long phoneTimeUTC = aGMTCalendar.getTimeInMillis()-3600000*2; </code></pre> <p>It does work OK.</p> <p>Any ideas?</p> <p>Thanks a lot,</p> <p>David.</p>
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