如何以秒为单位获取当前UTC时间 [英] How to get the current UTC time in seconds

问题描述

我有一个应用程序，需要以秒为单位比较时间.

I have an application, which needs to compare the time in seconds.

我想知道如何以秒为单位获取当前UTC时间.

I want to know how to get the current UTC time in seconds.

有人可以举一个例子吗?如何用Java做到这一点?

Can some one post an example of it how can we do this in Java?

推荐答案

您可以使用它来使时区传入您想回到的时区

You can use this to get timezone passing in timezone you want time back in

Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("UTC")); 

然后，您可以在日历对象上调用任何所需的内容

Then you can call whatever you want on the calendar object

System.out.println(cal.get(Calendar.YEAR));
System.out.println(cal.get(Calendar.HOUR));
System.out.println(cal.get(Calendar.HOUR_OF_DAY));
System.out.println(cal.get(Calendar.MINUTE));

下面的示例以秒为单位比较两个日历

Below example to compare two calendars in seconds

Calendar cal1 = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
Calendar cal2 = Calendar.getInstance(TimeZone.getTimeZone("UTC"));

// Set the dates for calendars
cal1.set(2011, 1, 1);
cal2.set(2011, 2, 2);

// Get the represented date in milliseconds as a long
long milis1 = cal1.getTimeInMillis();
long milis2 = cal2.getTimeInMillis();

// Calculate difference in milliseconds
long diff = milis2 - milis1;

// Calculate difference in seconds
long diffSecs = diff / 1000;

System.out.println("In seconds: " + diffSecs + " seconds");

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