timestap0 = 2016-12-31T23:59:59Z
timestap1 = 2016-12-31T23:59:60Z
timestap0.epoch == timestap1.epoch
That is why I prefer ISO 8601, more accurate and more human-readable.
And I do not think under the context of REST or GraphQL, a few extra bytes unix epoch saves will make any difference.
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