2.1.15 [ECMA-262/5] Section 15.9.1.14, TimeClip (time)
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The operator TimeClip calculates a number of milliseconds from its argument, which must be an ECMAScript Number value. This operator functions as follows: 1. If time is not finite, return NaN. 2. If abs(time) > 8.64 x 1015, return NaN. 3. Return an implementation-dependent choice of either ToInteger(time) or ToInteger(time) + (+0). (Adding a positive zero converts −0 to +0.)
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In step 3, ToInteger(time) is returned.