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fs: document the Date conversion in Stats objects

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Document why the dates are calculated with the timestamp
in Numbers + 0.5.

The comment was previously lost in a revert.

Refs: ae6c7044c8

PR-URL: https://github.com/nodejs/node/pull/28224
Refs: ae6c7044c8
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
This commit is contained in:
Joyee Cheung 2019-06-14 23:05:04 +08:00 committed by Ruben Bridgewater
parent c72506c828
commit b6326ce0f7
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6
lib/internal/fs/utils.js
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@ -286,6 +286,12 @@ function nsFromTimeSpecBigInt(sec, nsec) {
return sec * kNsPerSecBigInt + nsec;
}
// The Date constructor performs Math.floor() to the timestamp.
// https://www.ecma-international.org/ecma-262/#sec-timeclip
// Since there may be a precision loss when the timestamp is
// converted to a floating point number, we manually round
// the timestamp here before passing it to Date().
// Refs: https://github.com/nodejs/node/pull/12607
function dateFromMs(ms) {
return new Date(Number(ms) + 0.5);
}