C Date and time utilities

From Cppreference

C++ Standard Library
Language Utilities library Strings library Containers library Algorithms library Iterators library Numerics library Input/output library Localizations library Regular expressions library (C++11) Atomic operations library (C++11) Thread support library (C++11)
Utilities library
Date and time utilities
time_point (C++11) duration (C++11) system_clock (C++11) steady_clock (C++11) high_resolution_clock (C++11) C library facilities
C-style date and time utilities
Functions Time manipulation difftime time clock Format conversions asctime ctime strftime gmtime localtime mktime Constants CLOCKS_PER_SEC Types tm time_t

Contents 1 Functions 1.1 Time manipulation 1.2 Format conversions 2 Constants 3 Types

[edit] Functions

Defined in header <ctime>
Time manipulation
difftime	computes the difference between times (function)
time	returns the current time of the system as time since epoch (function)
clock	returns raw processor clock time since the program is started (function)
Format conversions
asctime	converts a time_t object to a textual representation (function)
ctime	converts a tm object to a textual representation (function)
strftime	converts a tm object to custom textual representation (function)
wcsftime	converts a tm object to custom wide string textual representation (function)
gmtime	converts time since epoch to calendar time expressed as Universal Coordinated Time (function)
localtime	converts time since epoch to calendar time expressed as local time (function)
mktime	converts calendar time to time since epoch (function)

[edit] Constants

CLOCKS_PER_SEC	number of processor clock ticks per second (macro constant)

[edit] Types

tm	calendar time type
time_t	time since epoch type
clock_t	process running time