在Android上使用JODA的DateTime（）构造函数初始化时的奇怪行为

Question

I faced strange behaviour of JODA's time constructor.

So I execute following lines

DateTime d1 = new DateTime("1972-01-01T10:00:00.000+00:00");
DateTime d2 = new DateTime("1970-01-01T10:00:00.000+00:00");
String s1 = d1.toString();
String s2 = d2.toString();

and see that

s1 = 1972-01-01T10:00:00.000Z
s2 = 1970-01-01T11:00:00.000+01:00

Ok, I know about default time zone for DateTime, but why different calls returns time objects with different timezones?

If you try to change the first year 1972->1971, you see another picture

s1 = 1971-01-01T11:00:00.000+01:00
s2 = 1970-01-01T11:00:00.000+01:00

My current time zone is +1 (Europe/Berlin).

What have I missed?

Answer 1

I can't reproduce this for Europe/Berlin timezone, but that's the result I get with Europe/London , for all three years.

And iirc the reason is that in the early 70s the UK was in a period where we stayed on +1 all winter. So the epoch time expressed in Europe/London is actually 1970-01-01T01:00:00+01:00 .