问题描述
我有一个数据库表，该表通过ETL填充了来自大型机的数据。
该表的一列在每日时间中称为 TOD。
I have a database table, which is filled with data from a mainframe via ETL.One column of that table is called "TOD" as in Time-Of-Day.
此列存储的值包括：
CAE7631DC43DC686
CAE7631C4AC6DC0B
CAE6216DF2BC0D04
CAE621D8F9916E8E
This columns stores values such as :"CAE7631DC43DC686""CAE7631C4AC6DC0B""CAE6216DF2BC0D04""CAE621D8F9916E8E"
所有这些值均在2013年2月10日和2013年2月11日左右。现在，在大型机上，
是一个时间日期表示形式（TOD时钟）。
all these values are around Feb 10th 2013 and Feb 11th 2013.now, on mainframe, this is a time-date representation (TOD clock).
它表示从01.01.1900开始经过的时间（以毫秒为单位）（1 / 1 000 000秒）。
it represents the time past from 01.01.1900 in macroseconds (1/1 000 000 of a second).
我需要的是一个Java库/方法/算法实现，可以将这些字符串转换为java.util.Date。
What I need is a java library / method / algorithm implementation that could convert these strings to java.util.Date's.
在网络上找到了以下网站：
Found these sites on the web :http://paul.saers.com/Tod_howto.htmlhttp://www.longpelaexpertise.com.au/toolsTOD.php
此页说明了如何计算，但对我来说有点太多了。
我确定我会在某些地方出错。
This page explains how to calculate it, but it's a little too much for me.I'm sure I'd do some errors somewhere.
所以，我的问题是；您知道我可以使用的图书馆（Joda Time吗？）吗？
我需要将这些值转换为java.util.Date并将Date对象转换为字符串表示形式（例如 CAE621D8F9916E8E）。
So, my question is; do you know about a library (Joda Time ?) that I could use ?I need to convert these value to a java.util.Date and a Date object to a string representation, (like "CAE621D8F9916E8E").
推荐答案
使用Joda逐步进行操作：
Step by step, using Joda:
数据可以在您所引用的网站上 指出TOD以UTC表示
Data used in the calculation can be found on the website you referred to The other reference you gave states that TOD is expressed in UTC
// we start with your string minus the three last digits
// which are some internal z/Series cruft
BigInteger bi = new BigInteger ("CAE7631DC43DC", 16); // 686 stripped off
// then, from tables the website we get the TOD value for start of epoch
// here also, minus the three last digits
BigInteger startOfEpoch70 = new BigInteger ("7D91048BCA000", 16); // 000 stripped off
// using that we calculate the offset in microseconds in epoch
BigInteger microsinepoch = bi.subtract(startOfEpoch70);
// and reduce to millis
BigInteger millisinepoch = microsinepoch.divide(new BigInteger("1000"));
// which we convert to a long to feed to Joda
long millisinepochLong = millisinepoch.longValue();
// Et voila, the result in UTC
DateTime result = new DateTime(millisinepochLong).withZone(DateTimeZone.UTC);
// Now, if you want a result in some other timezone, that's equally easy
// with Joda:
DateTime result2 = result.toDateTime(DateTimeZone.forID("EET"));
System.out.println("The result is " + result + " or represented in timezone EET "
+ result2);
输出如下：
我所指的素材解释如下：
The "cruft" I refer to is explained as follows:
当然，除了残酷地从字符串中截取这些字节之外，还可以这样做
Of course, instead of brutally snipping these bytes off the string, one could also do
bi = bi.divide(new BigInteger("1000", 16));
除以十六进制1000也会删除最后12位。
as dividing by hex 1000 will also get rid of the last 12 bits.
编辑：正如Mehmet在评论中指出的那样，TOD为UTC，这意味着应告知生成的DateTime。为了方便起见，我还展示了如何将DateTime转换为另一个时区（以 EET 为例）
as Mehmet pointed out in the comments, TOD is in UTC and this means that the resulting DateTime should be told so. For convenience I also showed how to transpose that DateTime to another time zone (using EET as an example)
这篇关于TOD时钟时间为java.util.Date或毫秒的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！