std::chrono::time_point::operator+, operator-

time_point& operator+=( const duration& d );	(1)	(since C++11)
time_point& operator-=( const duration& d );	(2)	(since C++11)

Modifies the time point by the given duration.

1) Applies the offset d to pt. Effectively, d is added to the internally stored duration d_ as d_ += d.

2) Applies the offset d to pt in negative direction. Effectively, d is subtracted from internally stored duration d_ as d_ -= d.

Language
Standard library headers
Concepts
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)
Technical Specifications

Type support (basic types, RTTI, type traits)
Dynamic memory management
Error handling
Program utilities
Variadic functions
Date and time
Function objects
initializer_list (C++11)
bitset
hash (C++11)
Relational operators
rel_ops::operator!=rel_ops::operator>rel_ops::operator<=rel_ops::operator>=
Pairs and tuples
pair
tuple (C++11)
piecewise_construct_t (C++11)
piecewise_construct (C++11)
integer_sequence (C++14)
Swap, forward and move
swap
exchange (C++14)
forward (C++11)
move (C++11)
move_if_noexcept (C++11)
Type operations
declval (C++11)
as_const (C++17)

Member functions
time_point::time_point
time_point::time_since_epoch
time_point::operator+time_point::operator-
time_point::min
time_point::max
Non-member functions
common_type
operator+operator-
operator==operator!=operator<operator<=operator>operator>=
time_point_cast
floor (C++17)
ceil (C++17)
round (C++17)

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