Standard library header <ctime>

 

C++

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Concepts

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Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

 

Standard Library header files

Language Support
<cstddef> <limits> <climits> <cfloat> <cstdint> <new> <typeinfo> <exception> <ciso646>	<initializer_list> <csignal> <csetjmp> <cstdalign> <cstdarg> <cstdbool> <cstdlib> <ctime>
Diagnostics
<stdexcept> <cassert>	<cerrno> <system_error>
General utilities
<utility> <tuple> <bitset> <memory> <cstdlib> <cstring> <functional>	<type_traits> <ratio> <chrono> <ctime> <scoped_allocator> <typeindex>
Strings
<string> <cctype> <cwctype> <cstring>	<cwchar> <cstdlib> <cuchar>
Localization
<locale> <codectv> <clocale>

Containers
<array> <deque> <forward_list> <list> <vector> <map>	<set> <unordered_map> <unordered_set> <queue> <stack>
Iterators
<iterator>
Algorithms
<algorithm>	<cstdlib>
Numerics
<cfenv> <complex> <random> <valarray>	<numeric> <cmath> <ctgmath> <cstdlib>
Input/Output
<iosfwd> <iostream> <ios> <streambuf> <istream> <ostream>	<iomanip> <sstream> <fstream> <cstdio> <cinttypes>
Regular expressions
<regex>
Thread support
<thread> <mutex> <atomic>	<condition_variable> <future>

 

This header was originally in the C standard library as <time.h>.

This header is part of the C-style date and time library.

Functions

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 tm object to a textual representation (function)
ctime	converts a time_t 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)

Constants

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

Types

tm	calendar time type (class)
time_t	time since epoch type (typedef)
clock_t	process running time (typedef)