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UTC和GMT什么关系? - 知乎

UTC 是我们现在用的时间标准, GMT 是老的时间计量标准。UTC是根据原子钟来计算时间,而GMT是根据地球的自转和公转来计算时间,也就是太阳每天经过位于英国伦敦郊区的 皇家格林威治天文台 的时间就是中午12点,。由于现在世界上最精确的原子钟50亿年才会误差1秒 ( 最精确原子钟问世:50亿年误差 ...

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How to get UTC timestamp in Ruby? - Stack Overflow

How to get UTC timestamp in Ruby? @YukiMatsukura Actually, that's not entirely accurate either. A time stamp doesn't even represent any time zone, so "timestamp is UTC" is true as much as "timestamp is elephant poop". The problem is in representation. Most devs represent it as Unix time stamp (which does not indicate UTC or any other time zone as it's just an integer value).

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