time_t（C语言时间类型）
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<timefyi-glossary slug="time-t"></timefyi-glossary>定义
C语言用于表示时间的数据类型，通常以Unix纪元以来的秒数表示。历史上为32位有符号整数，导致2038年问题；现代系统改用64位time_t。