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LibJS: Ensure final computation in DayFromYear is performed on a double

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When we multiple by 365, ensure the result is a double (not an i32) to
prevent overflow.
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Timothy Flynn 2022-01-15 17:36:25 -05:00 • committed by Andreas Kling
parent 8d30e14d28
commit 8ad043fe5e
1 changed files with 1 additions and 1 deletions
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Userland/Libraries/LibJS/Runtime/Date.cpp
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@ -133,7 +133,7 @@ u16 days_in_year(i32 y)
double day_from_year(i32 y)
{
// 𝔽(365 × (ℝ(y) - 1970) + floor((ℝ(y) - 1969) / 4) - floor((ℝ(y) - 1901) / 100) + floor((ℝ(y) - 1601) / 400))
return 365 * (y - 1970) + floor((y - 1969) / 4.0) - floor((y - 1901) / 100.0) + floor((y - 1601) / 400.0);
return 365.0 * (y - 1970) + floor((y - 1969) / 4.0) - floor((y - 1901) / 100.0) + floor((y - 1601) / 400.0);
}
// TimeFromYear(y), https://tc39.es/ecma262/#eqn-TimeFromYear