How is time_t defined? [duplicate]

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What is ultimately a time_t typedef to?

In /usr/include/time.h time_t is defined as typedef __time_t time_t. What does this mean exactly? Is the type of time_t compiler specific? I have heard it is by default a long value.

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The Standard says:

7.23.1

The types declared are [...] time_t [...] which are arithmetic types capable of representing times

You just need to retain that it is an arithmetic type: you can perform arithmetic with values of time_t type.