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LibC: Make localtime() and gmtime() handle years before 1970

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Year computation has to be based on seconds, not days, in case
t is < 0 but t / __seconds_per_day is 0.

Year computation also has to consider negative timestamps.

With this, days is always positive and <= the number of days in the
year, so base the tm_wday computation directly on the timestamp,
and do it first, before t is modified in the year computation.
In C, % can return a negative number if the left operand is negative,
compensate for that.

Tested via test-js. (Except for tm_wday, since we don't implement
Date.prototype.getUTCDate() yet.)
This commit is contained in:
Nico Weber 2020-08-22 22:15:00 -04:00 • committed by Andreas Kling
parent fc28c9b085
commit 5f595e7e1b
2 changed files with 16 additions and 10 deletions
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10
Libraries/LibJS/Tests/builtins/Date/Date.prototype.toISOString.js
View file

@ -1,9 +1,7 @@
test("basic functionality", () => {
expect(new Date(1597955034555).toISOString()).toBe("2020-08-20T20:23:54.555Z");
// FIXME: Add these once they work.
//expect(new Date(Date.UTC(22020)).toISOString()).toBe("+022020-01-01T00:00:00.000Z");
//expect(new Date(Date.UTC(1950)).toISOString()).toBe("1950-01-01T00:00:00.000Z");
//expect(new Date(Date.UTC(1800)).toISOString()).toBe("1800-01-01T00:00:00.000Z");
//expect(new Date(Date.UTC(-100)).toISOString()).toBe("-000100-01-01T00:00:00.000Z");
expect(new Date(Date.UTC(22020)).toISOString()).toBe("+022020-01-01T00:00:00.000Z");
expect(new Date(Date.UTC(1950)).toISOString()).toBe("1950-01-01T00:00:00.000Z");
expect(new Date(Date.UTC(1800)).toISOString()).toBe("1800-01-01T00:00:00.000Z");
expect(new Date(Date.UTC(-100)).toISOString()).toBe("-000100-01-01T00:00:00.000Z");
});