Time.h
time.h is the C standard header that declares facilities for representing, querying, and manipulating calendar and processor time.
Modern C, Third Edition
time.h is the C standard header that declares calendar-time types and functions, including struct tm and related interfaces.
- How it is used
- Handles human-readable calendar time, timestamp differences, conversion, formatting, and physical-time queries.
- How deep it goes
- Explains struct tm fields, normalization through mktime, and formatting directives with concrete declarations and examples.
- Examples
- Uses designated struct tm initialization, member access, year calculation, and strftime format-specifier tables.
- What you can do after
- Apply it via standard interfaces to obtain timestamps, represent calendar dates, normalize fields, compare times, and format output.
Modern C
time.h is the C standard header that declares facilities for representing, querying, and manipulating calendar and processor time.
- How it is used
- Organizes calendar timestamps, human-readable date fields, formatting, and physical time measured in seconds and nanoseconds.
- How deep it goes
- Defines core representations and conversion steps, while deferring detailed locale behavior and implementation-specific formatting results.
- Examples
- Uses paired time calls, difftime, struct tm fields, mktime normalization, and strftime format specifiers.
- What you can do after
- Apply via time, difftime, mktime, strftime, and timespec_get to represent, compare, normalize, and format time values.
Related concepts
- system timeuses · A machine-provided or maintained representation of current time, commonly expressed as a calendar date and clock time.
- struct tmproduces · struct tm is a C standard library structure type representing broken-down calendar-time components such as seconds, minutes, days, months, and years.
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