05-23-2019
It is always best to always get in the habit of converting time text string (formatted time) to a unix timestamp (a number).
Then, format the timestamp(s) math results as needed.
It's always best in programming to separate the time functions and processing of time from the formatting of strings, because it is trivial to convert strings to timestamps and timestamps to formatted strings.
FYI, Just about every date stored in our database here at unix.com is a unix timestamp. We generally don't store formatted date strings in DB tables (unless of course the date is part of some text in a post).
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LEARN ABOUT DEBIAN
std::chrono::duration
std::chrono::duration< _Rep, _Period >(3cxx) std::chrono::duration< _Rep, _Period >(3cxx)
NAME
std::chrono::duration< _Rep, _Period > -
SYNOPSIS
Public Types
typedef _Period period
typedef _Rep rep
Public Member Functions
constexpr duration (const duration &)
template<typename _Rep2 , typename = typename enable_if<is_convertible<_Rep2, rep>::value &&
(treat_as_floating_point<rep>::value || !treat_as_floating_point<_Rep2>::value)>::type> constexpr duration (const
_Rep2 &__rep)
template<typename _Rep2 , typename _Period2 , typename = typename enable_if<treat_as_floating_point<rep>::value ||
(ratio_divide<_Period2, period>::type::den == 1 && !treat_as_floating_point<_Rep2>::value)>::type> constexpr
duration (const duration< _Rep2, _Period2 > &__d)
constexpr rep count () const
template<typename _Rep2 = rep> enable_if
<!treat_as_floating_point
< _Rep2 >::value, duration & >
::type operator%= (const rep &__rhs)"
template<typename _Rep2 = rep> enable_if
<!treat_as_floating_point
< _Rep2 >::value, duration & >
::type operator%= (const duration &__d)"
duration & operator*= (const rep &__rhs)
constexpr duration operator+ () const
duration & operator++ ()
duration operator++ (int)
duration & operator+= (const duration &__d)
constexpr duration operator- () const
duration & operator-- ()
duration operator-- (int)
duration & operator-= (const duration &__d)
duration & operator/= (const rep &__rhs)
duration & operator= (const duration &)
static_assert (!__is_duration< _Rep >::value,'rep cannot be a duration')
static_assert (__is_ratio< _Period >::value,'period must be a specialization of ratio')
static_assert (_Period::num > 0,'period must be positive')
Static Public Member Functions
static constexpr duration max ()
static constexpr duration min ()
static constexpr duration zero ()
Detailed Description
template<typename _Rep, typename _Period>struct std::chrono::duration< _Rep, _Period >
duration
Definition at line 221 of file chrono.
Author
Generated automatically by Doxygen for libstdc++ from the source code.
libstdc++ Tue Nov 27 2012 std::chrono::duration< _Rep, _Period >(3cxx)