---
name: "std::literals_chrono::literals"
section: "3cxx"
platform: "linux"
package: "libstdc++-11-doc"
version: "11.3.0-12"
release: "Debian 12 (Bookworm)"
platforms: ["linux"]
url: "https://new.carta.tech/std::literals_chrono::literals"
---

# std::literals\_chrono::literals(3cxx)

## NAME

std::literals::chrono\_literals

## SYNOPSIS

### Functions

template\<char... \_Digits\> constexpr **chrono::hours** **operator''h** ()\
 Literal suffix for durations of type `std::chrono::hours`  constexpr **chrono::duration**\< long double, **ratio**\< 3600, 1 \> \> **operator''h** (long double \_\_hours)\
 Literal suffix for durations representing non-integer hours.  template\<char... \_Digits\> constexpr **chrono::minutes** **operator''min** ()\
 Literal suffix for durations of type `std::chrono::minutes`  constexpr **chrono::duration**\< long double, **ratio**\< 60, 1 \> \> **operator''min** (long double \_\_mins)\
 Literal suffix for durations representing non-integer minutes.  template\<char... \_Digits\> constexpr **chrono::milliseconds** **operator''ms** ()\
 Literal suffix for durations of type `std::chrono::milliseconds`  constexpr **chrono::duration**\< long double, **milli** \> **operator''ms** (long double \_\_msecs)\
 Literal suffix for durations representing non-integer milliseconds.  template\<char... \_Digits\> constexpr **chrono::nanoseconds** **operator''ns** ()\
 Literal suffix for durations of type `std::chrono::nanoseconds`  constexpr **chrono::duration**\< long double, **nano** \> **operator''ns** (long double \_\_nsecs)\
 Literal suffix for durations representing non-integer nanoseconds.  template\<char... \_Digits\> constexpr **chrono::seconds** **operator''s** ()\
 Literal suffix for durations of type `std::chrono::seconds`  constexpr **chrono::duration**\< long double \> **operator''s** (long double \_\_secs)\
 Literal suffix for durations representing non-integer seconds.  template\<char... \_Digits\> constexpr **chrono::microseconds** **operator''us** ()\
 Literal suffix for durations of type `std::chrono::microseconds`  constexpr **chrono::duration**\< long double, **micro** \> **operator''us** (long double \_\_usecs)\
 Literal suffix for durations representing non-integer microseconds.

## Detailed Description

ISO C++ 2014 namespace for suffixes for duration literals.

These suffixes can be used to create `chrono::duration` values with tick periods of hours, minutes, seconds, milliseconds, microseconds or nanoseconds. For example, `std::chrono::seconds(5)` can be written as `5s` after making the suffix visible in the current scope. The suffixes can be made visible by a using-directive or using-declaration such as:

- •

  `using namespace std::chrono_literals;`

- •

  `using namespace std::literals;`

- •

  `using namespace std::chrono;`

- •

  `using namespace std;`

- •

  `using std::chrono_literals::operator''s;`

The result of these suffixes on an integer literal is one of the standard typedefs such as `std::chrono::hours`. The result on a floating-point literal is a duration type with the specified tick period and an unspecified floating-point representation, for example `1.5e2ms` might be equivalent to `chrono::duration<long double, chrono::milli>(1.5e2)`.

## Author

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