[squeak-dev] DateAndTimeLeapTest>>testAsSeconds is broken

Bert Freudenberg bert at freudenbergs.de
Thu Dec 1 15:17:47 UTC 2016


On Thu, Dec 1, 2016 at 2:29 PM, David T. Lewis <lewis at mail.msen.com> wrote:

> On Thu, Dec 01, 2016 at 11:07:45AM +0100, Bert Freudenberg wrote:
>
Here I am raising a different (but admittedly related) question. How many
> seconds
> elapsed between the Smalltalk epoch and the time 2004-02-29T13:33:00+02:00?
>

=> 3255507180 + DateAndTime localOffset asSeconds

My reasoning:

('1901-01-01T00:00:00+02:00' asDateAndTime - DateAndTime epoch) asSeconds
 = (0 + DateAndTime localOffset asSeconds - 7200)

and so

('2004-02-29T13:33:00+02:00' asDateAndTime - DateAndTime epoch) asSeconds =
(3255514380 + DateAndTime localOffset asSeconds - 7200)

It can't be a constant but needs to take into account the local time zone.
Because Smalltalk epoch is defined as local time, the difference to a fixed
time necessarily involves the timezone offset.

- Bert -
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