java中算两个时间内的秒数_java – Joda Time – 计算两个日期之间的秒数会引发异常....

我使用以下代码来计算两个日期之间的秒数差异：

long secondsBetween = (Seconds.secondsBetween(new LocalDate("1901-01-01"), new LocalDate()).getSeconds());

但是我得到以下异常：

08-08 18:21:27.345: E/AndroidRuntime(6972): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.testbdr/com.testbdr.MainActivity}: java.lang.ArithmeticException: Value cannot fit in an int: 3584908800

08-08 18:21:27.345: E/AndroidRuntime(6972): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2189)

08-08 18:21:27.345: E/AndroidRuntime(6972): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2216)

08-08 18:21:27.345: E/AndroidRuntime(6972): at android.app.ActivityThread.access$600(ActivityThread.java:149)

08-08 18:21:27.345: E/AndroidRuntime(6972): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1305)

08-08 18:21:27.345: E/AndroidRuntime(6972): at android.os.Handler.dispatchMessage(Handler.java:99)

08-08 18:21:27.345: E/AndroidRuntime(6972): at android.os.Looper.loop(Looper.java:153)

08-08 18:21:27.345: E/AndroidRuntime(6972): at android.app.ActivityThread.main(ActivityThread.java:5000)

08-08 18:21:27.345: E/AndroidRuntime(6972): at java.lang.reflect.Method.invokeNative(Native Method)

08-08 18:21:27.345: E/AndroidRuntime(6972): at java.lang.reflect.Method.invoke(Method.java:511)

08-08 18:21:27.345: E/AndroidRuntime(6972): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:821)

08-08 18:21:27.345: E/AndroidRuntime(6972): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:584)

08-08 18:21:27.345: E/AndroidRuntime(6972): at dalvik.system.NativeStart.main(Native Method)

08-08 18:21:27.345: E/AndroidRuntime(6972): Caused by: java.lang.ArithmeticException: Value cannot fit in an int: 3584908800

08-08 18:21:27.345: E/AndroidRuntime(6972): at org.joda.time.field.FieldUtils.safeToInt(FieldUtils.java:206)

08-08 18:21:27.345: E/AndroidRuntime(6972): at org.joda.time.field.BaseDurationField.getDifference(BaseDurationField.java:141)

08-08 18:21:27.345: E/AndroidRuntime(6972): at org.joda.time.chrono.BaseChronology.get(BaseChronology.java:260)

08-08 18:21:27.345: E/AndroidRuntime(6972): at org.joda.time.base.BaseSingleFieldPeriod.between(BaseSingleFieldPeriod.java:105)

08-08 18:21:27.345: E/AndroidRuntime(6972): at org.joda.time.Seconds.secondsBetween(Seconds.java:124)

08-08 18:21:27.345: E/AndroidRuntime(6972): at com.testbdr.MainActivity.onCreate(MainActivity.java:27)

08-08 18:21:27.345: E/AndroidRuntime(6972): at android.app.Activity.performCreate(Activity.java:5020)

08-08 18:21:27.345: E/AndroidRuntime(6972): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)

08-08 18:21:27.345: E/AndroidRuntime(6972): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2153)

08-08 18:21:27.345: E/AndroidRuntime(6972): ... 11 more

解决方法:

INT

正如其他答案正确陈述的那样,问题是你和Joda-Time正在使用int来处理秒数.一个32位的int只能容纳大约68年的秒数.

如果你坚持使用秒来跟踪几个世纪的时间,你必须使用64位长而不是32位int.

顺便说一下,在Unix中使用32位int来跟踪时间的秒数表示现实世界的问题知道Year 2038 problem.

秒不用于长时间跨度

正如其他人所说,使用秒来跟踪如此长的时间跨度是不寻常的.如果可能的话,您可能想重新考虑这个前提.

一种替代方案：ISO 8601标准提供Durations格式的PnYnMnDTnHnMnS,包括年,月,日等. Joda-Time知道如何解析并生成这样的字符串(Period和Duration类).虽然Joda-Time只能处理数字秒数,但是当它以ISO 8601格式呈现为字符串时,它可以处理更大的秒数,如下面的代码示例所示(PT3584908800S).

毫秒

Joda-Time使用毫秒内部跟踪epoch的计数. Joda-Time提供了访问这些毫秒长值的方法.

我通常建议你在几毫秒内完成日期工作.但在你的情况下,它是有道理的,根据需要转换为秒.

一天的开始

要计算毫秒数,我们需要使用DateTime而不是LocalDate.

养成用TimeAtStartOfDay调用方法的习惯,以获得当天的第一个时刻.这个时间通常是00:00:00,但并不总是因为夏令时或其他异常.

时区

即使对于LocalDate,时区也是至关重要的.日期(和一天的第一时刻)由时区决定.巴黎的新日早些时候比蒙特利尔更新.

如果省略时区,将使用JVM的当前默认时区.通常更好地明确并指定所需的时区.我怀疑你的目的,使用UTC是有道理的.

持续时间

Joda-Time提供了Duration课程,表示与时间轴(宇宙历史)无关的时间跨度.

示例代码

使用Joda-Time 2.4的示例代码.

DateTime history = new DateTime( "1901-01-01", DateTimeZone.UTC ).withTimeAtStartOfDay(); // Technically, the call to withTimeAtStartOfDay is not necessary here as Joda-Time defaults to that for parsing a date-only string. But the call is a good habit and makes clear out intention.

DateTime today = new DateTime( DateTimeZone.UTC ).withTimeAtStartOfDay();

Duration duration = new Duration( history, today );

long millis = duration.getMillis(); // Use a long, not an int.

long seconds = ( millis / 1000L ); // Use a long, not an int. Maybe use BigDecimal or BigInteger if you want rounding.

转储到控制台.

System.out.println( "history: " + history );

System.out.println( "today: " + today );

System.out.println( "duration: " + duration );

System.out.println( "millis: " + millis );

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

跑步时

history: 1901-01-01T00:00:00.000Z