Mktime
mktime is a C standard-library function that converts a local broken-down calendar time to time_t while normalizing its fields.
Modern C, Third Edition
mktime is a C standard-library function that normalizes a local broken-down time and converts it to time_t.
- How it is used
- Normalizes local broken-down dates and converts them into arithmetic time_t values.
- How deep it goes
- Explains normalization, derived fields, DST resolution, and time_t conversion, but does not detail implementation internals.
- Examples
- Uses the mktime declaration and the struct tm fields tm_wday, tm_yday, and tm_isdst as concrete artifacts.
- What you can do after
- Apply mktime to normalize a local struct tm and obtain its corresponding time_t representation.
Modern C
mktime is a C standard library function that converts a broken-down local calendar time to a time_t value while normalizing its fields.
- How it is used
- Converts and normalizes local broken-down calendar times for subsequent time computations.
- How deep it goes
- Explains field conventions and three normalization steps, but defers implementation details.
- Examples
- Uses January numbering, Gregorian-year adjustment, weekday and yearday updates, and DST inference as concrete field examples.
- What you can do after
- Apply it via the C library to normalize a local struct tm and obtain a time_t value.
Related concepts
- time_tproduces · time_t is an implementation-defined C arithmetic type used to represent calendar time or elapsed-time values.
- struct tmuses · struct tm is a C standard library structure type representing broken-down calendar-time components such as seconds, minutes, days, months, and years.
- localtime_sequivalent to · localtime_s is an Annex K C library function that converts a time_t value to a broken-down local time in a caller-provided object.
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