__TIME__
__TIME__ is a predefined C macro that expands to a string literal specifying the time of translation.
Modern C, Third Edition
__TIME__ is a predefined C macro that expands to a string literal containing the time of translation.
- How it is used
- Provides translation-time information for diagnostic output and invocation-context traces.
- How deep it goes
- Defines the expansion as a string literal containing translation time but does not specify its representation or formatting.
- Examples
- Uses diagnostic output and contrasts translation-time macros with runtime interfaces such as time and difftime.
- What you can do after
- Apply __TIME__ in diagnostic output while recognizing that it records translation context rather than runtime time.
Modern C
__TIME__ is a predefined C macro that expands to a string literal containing the time of compilation.
- How it is used
- Distinguishes compile-time identification from runtime calendar-time operations.
- How deep it goes
- Defines the expansion result and compilation-time meaning without detailing preprocessing mechanics or formatting rules.
- What you can do after
- Evaluate whether a timestamp represents compilation time or runtime calendar time.
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