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October 19

向来只知道new Date(0)是1970年1月1日

今天在laszlo里写new Date(1970,0,1,0,0).getTime()却得到了-28800000的答案，一除，相差了8小时，心想这肯定是因为我们在+8时区了，顿时很迷惑，到底该用new Date(0)还是new Date(1970,0,1,0,0)。

又在java里写了一个测试，果然，

  Calendar cal = new GregorianCalendar();
  cal.setTime(new Date(0));
  assertEquals(1970, cal.get(Calendar.YEAR));
  assertEquals(0, cal.get(Calendar.MONTH));
  assertEquals(1, cal.get(Calendar.DAY_OF_MONTH));
  assertEquals(8, cal.get(Calendar.HOUR_OF_DAY));
  assertEquals(0, cal.getTimeInMillis());

Calendar cal2 = new GregorianCalendar(1970, 0, 1, 0, 0, 0);
assertEquals(0, cal2.getTimeInMillis() + cal2.get(Calendar.ZONE_OFFSET));

想想也对，Date是带着TimeZone信息的，而这个时间0点又不能因为地区的不同而有不同的含义，嗯……这下认识到了

在laszlo中的写法就是

var tempt=new Date(1970, 0, 1);
if (tempt.getTime()==tempt.getTimezoneOffset()*60000);

而我想，在我需要的这个地方还是用0比较好，而不是各个地区的"0"。

11:41 AM | Blog it | 工作

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