diff --git a/libcxx/docs/Status/SpaceshipProjects.csv b/libcxx/docs/Status/SpaceshipProjects.csv
--- a/libcxx/docs/Status/SpaceshipProjects.csv
+++ b/libcxx/docs/Status/SpaceshipProjects.csv
@@ -165,13 +165,13 @@
 | `[time.cal.mwd] <https://wg21.link/time.cal.mwd>`_
 | `[time.cal.mwdlast] <https://wg21.link/time.cal.mwdlast>`_
 | `[time.cal.ymwd] <https://wg21.link/time.cal.ymwd>`_
-| `[time.cal.ymwdlast] <https://wg21.link/time.cal.ymwdlast>`_","| `weekday`
-| `weekday_indexed`
-| `weekday_last`
-| `month_weekday`
-| `month_weekday_last`
-| `year_month_weekday`
-| `year_month_weekday_last`",None,Unassigned,|Not Started|
+| `[time.cal.ymwdlast] <https://wg21.link/time.cal.ymwdlast>`_","| `weekday <https://reviews.llvm.org/D152699>`_
+| `weekday_indexed <https://reviews.llvm.org/D152699>`_
+| `weekday_last <https://reviews.llvm.org/D152699>`_
+| `month_weekday <https://reviews.llvm.org/D152699>`_
+| `month_weekday_last <https://reviews.llvm.org/D152699>`_
+| `year_month_weekday <https://reviews.llvm.org/D152699>`_
+| `year_month_weekday_last <https://reviews.llvm.org/D152699>`_",None,Hristo Hristov,|Complete|
 "| `[time.zone.nonmembers] <https://wg21.link/time.zone.nonmembers>`_
 | `[time.zone.zonedtime.nonmembers] <https://wg21.link/time.zone.zonedtime.nonmembers>`_
 | `[time.zone.leap.nonmembers] <https://wg21.link/time.zone.leap.nonmembers>`_
diff --git a/libcxx/include/__chrono/month_weekday.h b/libcxx/include/__chrono/month_weekday.h
--- a/libcxx/include/__chrono/month_weekday.h
+++ b/libcxx/include/__chrono/month_weekday.h
@@ -41,10 +41,6 @@
 bool operator==(const month_weekday& __lhs, const month_weekday& __rhs) noexcept
 { return __lhs.month() == __rhs.month() && __lhs.weekday_indexed() == __rhs.weekday_indexed(); }
 
-_LIBCPP_HIDE_FROM_ABI inline constexpr
-bool operator!=(const month_weekday& __lhs, const month_weekday& __rhs) noexcept
-{ return !(__lhs == __rhs); }
-
 _LIBCPP_HIDE_FROM_ABI inline constexpr
 month_weekday operator/(const month& __lhs, const weekday_indexed& __rhs) noexcept
 { return month_weekday{__lhs, __rhs}; }
@@ -77,11 +73,6 @@
 bool operator==(const month_weekday_last& __lhs, const month_weekday_last& __rhs) noexcept
 { return __lhs.month() == __rhs.month() && __lhs.weekday_last() == __rhs.weekday_last(); }
 
-_LIBCPP_HIDE_FROM_ABI inline constexpr
-bool operator!=(const month_weekday_last& __lhs, const month_weekday_last& __rhs) noexcept
-{ return !(__lhs == __rhs); }
-
-
 _LIBCPP_HIDE_FROM_ABI inline constexpr
 month_weekday_last operator/(const month& __lhs, const weekday_last& __rhs) noexcept
 { return month_weekday_last{__lhs, __rhs}; }
diff --git a/libcxx/include/__chrono/weekday.h b/libcxx/include/__chrono/weekday.h
--- a/libcxx/include/__chrono/weekday.h
+++ b/libcxx/include/__chrono/weekday.h
@@ -69,10 +69,6 @@
 bool operator==(const weekday& __lhs, const weekday& __rhs) noexcept
 { return __lhs.c_encoding() == __rhs.c_encoding(); }
 
-_LIBCPP_HIDE_FROM_ABI inline constexpr
-bool operator!=(const weekday& __lhs, const weekday& __rhs) noexcept
-{ return !(__lhs == __rhs); }
-
 _LIBCPP_HIDE_FROM_ABI inline constexpr
 bool operator< (const weekday& __lhs, const weekday& __rhs) noexcept
 { return __lhs.c_encoding() < __rhs.c_encoding(); }
@@ -138,11 +134,6 @@
 bool operator==(const weekday_indexed& __lhs, const weekday_indexed& __rhs) noexcept
 { return __lhs.weekday() == __rhs.weekday() && __lhs.index() == __rhs.index(); }
 
-_LIBCPP_HIDE_FROM_ABI inline constexpr
-bool operator!=(const weekday_indexed& __lhs, const weekday_indexed& __rhs) noexcept
-{ return !(__lhs == __rhs); }
-
-
 class weekday_last {
 private:
     chrono::weekday __wd_;
@@ -157,10 +148,6 @@
 bool operator==(const weekday_last& __lhs, const weekday_last& __rhs) noexcept
 { return __lhs.weekday() == __rhs.weekday(); }
 
-_LIBCPP_HIDE_FROM_ABI inline constexpr
-bool operator!=(const weekday_last& __lhs, const weekday_last& __rhs) noexcept
-{ return !(__lhs == __rhs); }
-
 _LIBCPP_HIDE_FROM_ABI inline constexpr
 weekday_indexed weekday::operator[](unsigned __index) const noexcept { return weekday_indexed{*this, __index}; }
 
diff --git a/libcxx/include/__chrono/year_month_weekday.h b/libcxx/include/__chrono/year_month_weekday.h
--- a/libcxx/include/__chrono/year_month_weekday.h
+++ b/libcxx/include/__chrono/year_month_weekday.h
@@ -98,10 +98,6 @@
 bool operator==(const year_month_weekday& __lhs, const year_month_weekday& __rhs) noexcept
 { return __lhs.year() == __rhs.year() && __lhs.month() == __rhs.month() && __lhs.weekday_indexed() == __rhs.weekday_indexed(); }
 
-_LIBCPP_HIDE_FROM_ABI inline constexpr
-bool operator!=(const year_month_weekday& __lhs, const year_month_weekday& __rhs) noexcept
-{ return !(__lhs == __rhs); }
-
 _LIBCPP_HIDE_FROM_ABI inline constexpr
 year_month_weekday operator/(const year_month& __lhs, const weekday_indexed& __rhs) noexcept
 { return year_month_weekday{__lhs.year(), __lhs.month(), __rhs}; }
@@ -191,11 +187,6 @@
 bool operator==(const year_month_weekday_last& __lhs, const year_month_weekday_last& __rhs) noexcept
 { return __lhs.year() == __rhs.year() && __lhs.month() == __rhs.month() && __lhs.weekday_last() == __rhs.weekday_last(); }
 
-_LIBCPP_HIDE_FROM_ABI inline constexpr
-bool operator!=(const year_month_weekday_last& __lhs, const year_month_weekday_last& __rhs) noexcept
-{ return !(__lhs == __rhs); }
-
-
 _LIBCPP_HIDE_FROM_ABI inline constexpr
 year_month_weekday_last operator/(const year_month& __lhs, const weekday_last& __rhs) noexcept
 { return year_month_weekday_last{__lhs.year(), __lhs.month(), __rhs}; }
diff --git a/libcxx/include/chrono b/libcxx/include/chrono
--- a/libcxx/include/chrono
+++ b/libcxx/include/chrono
@@ -390,7 +390,6 @@
 class weekday;
 
 constexpr bool operator==(const weekday& x, const weekday& y) noexcept;
-constexpr bool operator!=(const weekday& x, const weekday& y) noexcept;
 constexpr weekday operator+(const weekday& x, const days&    y) noexcept;
 constexpr weekday operator+(const days&    x, const weekday& y) noexcept;
 constexpr weekday operator-(const weekday& x, const days&    y) noexcept;
@@ -403,7 +402,6 @@
 
 class weekday_indexed;
 constexpr bool operator==(const weekday_indexed& x, const weekday_indexed& y) noexcept;
-constexpr bool operator!=(const weekday_indexed& x, const weekday_indexed& y) noexcept;
 
 template<class charT, class traits>
   basic_ostream<charT, traits>&
@@ -413,7 +411,6 @@
 class weekday_last;
 
 constexpr bool operator==(const weekday_last& x, const weekday_last& y) noexcept;
-constexpr bool operator!=(const weekday_last& x, const weekday_last& y) noexcept;
 
 template<class charT, class traits>
   basic_ostream<charT, traits>&
@@ -443,7 +440,6 @@
 class month_weekday;
 
 constexpr bool operator==(const month_weekday& x, const month_weekday& y) noexcept;
-constexpr bool operator!=(const month_weekday& x, const month_weekday& y) noexcept;
 
 template<class charT, class traits>
   basic_ostream<charT, traits>&
@@ -453,7 +449,6 @@
 class month_weekday_last;
 
 constexpr bool operator==(const month_weekday_last& x, const month_weekday_last& y) noexcept;
-constexpr bool operator!=(const month_weekday_last& x, const month_weekday_last& y) noexcept;
 
 template<class charT, class traits>
   basic_ostream<charT, traits>&
@@ -523,8 +518,6 @@
 
 constexpr bool operator==(const year_month_weekday& x,
                           const year_month_weekday& y) noexcept;
-constexpr bool operator!=(const year_month_weekday& x,
-                          const year_month_weekday& y) noexcept;
 
 constexpr year_month_weekday
   operator+(const year_month_weekday& ymwd, const months& dm) noexcept;
@@ -548,8 +541,6 @@
 
 constexpr bool operator==(const year_month_weekday_last& x,
                           const year_month_weekday_last& y) noexcept;
-constexpr bool operator!=(const year_month_weekday_last& x,
-                          const year_month_weekday_last& y) noexcept;
 constexpr year_month_weekday_last
   operator+(const year_month_weekday_last& ymwdl, const months& dm) noexcept;
 constexpr year_month_weekday_last