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Reference

C library:
- <cassert> (assert.h)
- <cctype> (ctype.h)
- <cerrno> (errno.h)
- C++11
  <cfenv> (fenv.h)
- <cfloat> (float.h)
- C++11
  <cinttypes> (inttypes.h)
- <ciso646> (iso646.h)
- <climits> (limits.h)
- <clocale> (locale.h)
- <cmath> (math.h)
- <csetjmp> (setjmp.h)
- <csignal> (signal.h)
- <cstdarg> (stdarg.h)
- C++11
  <cstdbool> (stdbool.h)
- <cstddef> (stddef.h)
- C++11
  <cstdint> (stdint.h)
- <cstdio> (stdio.h)
- <cstdlib> (stdlib.h)
- <cstring> (string.h)
- C++11
  <ctgmath> (tgmath.h)
- <ctime> (time.h)
- C++11
  <cuchar> (uchar.h)
- <cwchar> (wchar.h)
- <cwctype> (wctype.h)
Containers:
- C++11
  <array>
- <deque>
- C++11
  <forward_list>
- <list>
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  <unordered_map>
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  <unordered_set>
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Input/Output:
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Multi-threading:
- C++11
  <atomic>
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  <condition_variable>
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  <future>
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  <tuple>
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  <type_traits>
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  <typeindex>
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- <utility>
- <valarray>

<ctime> (time.h)

functions
- asctime
- clock
- ctime
- difftime
- gmtime
- localtime
- mktime
- strftime
- time
macros
- CLOCKS_PER_SEC
- NULL
types
- clock_t
- size_t
- time_t
- struct tm

Reference
<ctime>
struct tm

type

struct tm

Time structure

Structure containing a calendar date and time broken down into its components.

The structure contains nine members of type int (in any order), which are:

Member	Type	Meaning	Range
`tm_sec`	`int`	seconds after the minute	`0-61*`
`tm_min`	`int`	minutes after the hour	`0-59`
`tm_hour`	`int`	hours since midnight	`0-23`
`tm_mday`	`int`	day of the month	`1-31`
`tm_mon`	`int`	months since January	`0-11`
`tm_year`	`int`	years since 1900
`tm_wday`	`int`	days since Sunday	`0-6`
`tm_yday`	`int`	days since January 1	`0-365`
`tm_isdst`	`int`	Daylight Saving Time flag

Member	Type	Meaning	Range
`tm_sec`	`int`	seconds after the minute	`0-60*`
`tm_min`	`int`	minutes after the hour	`0-59`
`tm_hour`	`int`	hours since midnight	`0-23`
`tm_mday`	`int`	day of the month	`1-31`
`tm_mon`	`int`	months since January	`0-11`
`tm_year`	`int`	years since 1900
`tm_wday`	`int`	days since Sunday	`0-6`
`tm_yday`	`int`	days since January 1	`0-365`
`tm_isdst`	`int`	Daylight Saving Time flag

The Daylight Saving Time flag (tm_isdst) is greater than zero if Daylight Saving Time is in effect, zero if Daylight Saving Time is not in effect, and less than zero if the information is not available.

* tm_sec is generally 0-59. The extra range is to accommodate for leap seconds in certain systems.

functions

macros

types

struct tm

See also