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diff --git a/libcxx/modules/std/chrono.cppm b/libcxx/modules/std/chrono.cppm
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+++ b/libcxx/modules/std/chrono.cppm
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+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <chrono>
+
+export module std:chrono;
+export namespace std {
+
+  namespace chrono {
+    using std::chrono::duration;
+    using std::chrono::time_point;
+
+  } // namespace chrono
+
+  using std::common_type;
+
+  namespace chrono {
+
+    // [time.traits], customization traits
+    using std::chrono::treat_as_floating_point;
+    using std::chrono::treat_as_floating_point_v;
+
+    using std::chrono::duration_values;
+
+    // using std::chrono::is_clock;
+    // using std::chrono::is_clock_v;
+
+    // [time.duration.nonmember], duration arithmetic
+    using std::chrono::operator+;
+    using std::chrono::operator-;
+    using std::chrono::operator*;
+    using std::chrono::operator/;
+    using std::chrono::operator%;
+
+    // [time.duration.comparisons], duration comparisons
+    using std::chrono::operator==;
+    using std::chrono::operator!=;
+    using std::chrono::operator<;
+    using std::chrono::operator>;
+    using std::chrono::operator<=;
+    using std::chrono::operator>=;
+    using std::chrono::operator<=>;
+
+    // [time.duration.cast], conversions
+    using std::chrono::ceil;
+    using std::chrono::duration_cast;
+    using std::chrono::floor;
+    using std::chrono::round;
+
+    // [time.duration.io], duration I/O
+#if !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
+    using std::chrono::operator<<;
+#endif
+    // using std::chrono::from_stream;
+
+    // convenience typedefs
+    using std::chrono::days;
+    using std::chrono::hours;
+    using std::chrono::microseconds;
+    using std::chrono::milliseconds;
+    using std::chrono::minutes;
+    using std::chrono::months;
+    using std::chrono::nanoseconds;
+    using std::chrono::seconds;
+    using std::chrono::weeks;
+    using std::chrono::years;
+
+    // [time.point.nonmember], time_point arithmetic
+
+    // [time.point.comparisons], time_point comparisons
+
+    // [time.point.cast], conversions
+    using std::chrono::time_point_cast;
+
+    // [time.duration.alg], specialized algorithms
+    using std::chrono::abs;
+
+    // [time.clock.system], class system_clock
+    using std::chrono::system_clock;
+
+    using std::chrono::sys_days;
+    using std::chrono::sys_seconds;
+    using std::chrono::sys_time;
+
+#if 0
+    // [time.clock.utc], class utc_clock
+    using std::chrono::utc_clock;
+
+    using std::chrono::utc_seconds;
+    using std::chrono::utc_time;
+
+    using std::chrono::leap_second_info;
+
+    using std::chrono::get_leap_second_info;
+    // [time.clock.tai], class tai_clock
+    using std::chrono::tai_clock;
+
+    using std::chrono::tai_seconds;
+    using std::chrono::tai_time;
+
+    // [time.clock.gps], class gps_clock
+    using std::chrono::gps_clock;
+
+    using std::chrono::gps_seconds;
+    using std::chrono::gps_time;
+#endif
+    // [time.clock.file], type file_clock
+    using std::chrono::file_clock;
+
+    using std::chrono::file_time;
+
+    // [time.clock.steady], class steady_clock
+    using std::chrono::steady_clock;
+
+    // [time.clock.hires], class high_resolution_clock
+    using std::chrono::high_resolution_clock;
+
+    // [time.clock.local], local time
+    using std::chrono::local_days;
+    using std::chrono::local_seconds;
+    using std::chrono::local_t;
+    using std::chrono::local_time;
+
+    // [time.clock.cast], time_point conversions
+    // using std::chrono::clock_time_conversion;
+
+    // using std::chrono::clock_cast;
+
+    // [time.cal.last], class last_spec
+    using std::chrono::last_spec;
+
+    // [time.cal.day], class day
+    using std::chrono::day;
+
+    // [time.cal.month], class month
+    using std::chrono::month;
+
+    // [time.cal.year], class year
+    using std::chrono::year;
+
+    // [time.cal.wd], class weekday
+    using std::chrono::weekday;
+
+    // [time.cal.wdidx], class weekday_indexed
+    using std::chrono::weekday_indexed;
+
+    // [time.cal.wdlast], class weekday_last
+    using std::chrono::weekday_last;
+
+    // [time.cal.md], class month_day
+    using std::chrono::month_day;
+
+    // [time.cal.mdlast], class month_day_last
+    using std::chrono::month_day_last;
+
+    // [time.cal.mwd], class month_weekday
+    using std::chrono::month_weekday;
+
+    // [time.cal.mwdlast], class month_weekday_last
+    using std::chrono::month_weekday_last;
+
+    // [time.cal.ym], class year_month
+    using std::chrono::year_month;
+
+    // [time.cal.ymd], class year_month_day
+    using std::chrono::year_month_day;
+
+    // [time.cal.ymdlast], class year_month_day_last
+    using std::chrono::year_month_day_last;
+
+    // [time.cal.ymwd], class year_month_weekday
+    using std::chrono::year_month_weekday;
+
+    // [time.cal.ymwdlast], class year_month_weekday_last
+    using std::chrono::year_month_weekday_last;
+
+    // [time.cal.operators], civil calendar conventional syntax operators
+
+    // [time.hms], class template hh_mm_ss
+    using std::chrono::hh_mm_ss;
+
+    // [time.12], 12/24 hour functions
+    using std::chrono::is_am;
+    using std::chrono::is_pm;
+    using std::chrono::make12;
+    using std::chrono::make24;
+
+#if 0
+    // [time.zone.db], time zone database
+    using std::chrono::tzdb;
+    using std::chrono::tzdb_list;
+
+    // [time.zone.db.access], time zone database access
+    using std::chrono::current_zone;
+    using std::chrono::get_tzdb;
+    using std::chrono::get_tzdb_list;
+    using std::chrono::locate_zone;
+
+    // [time.zone.db.remote], remote time zone database support
+    using std::chrono::reload_tzdb;
+    using std::chrono::remote_version;
+
+    // [time.zone.exception], exception classes
+    using std::chrono::ambiguous_local_time;
+    using std::chrono::nonexistent_local_time;
+
+    // [time.zone.info], information classes
+    using std::chrono::sys_info;
+
+    // [time.zone.timezone], class time_zone
+    using std::chrono::choose;
+    using std::chrono::time_zone;
+
+    // [time.zone.zonedtraits], class template zoned_traits
+    using std::chrono::zoned_traits;
+
+    // [time.zone.zonedtime], class template zoned_time
+    using std::chrono::zoned_time;
+
+    using std::chrono::zoned_seconds;
+
+    // [time.zone.leap], leap second support
+    using std::chrono::leap_second;
+
+    // [time.zone.link], class time_zone_link
+    using std::chrono::time_zone_link;
+
+    // [time.format], formatting
+    using std::chrono::local_time_format;
+#endif
+  } // namespace chrono
+
+  using std::formatter;
+
+  namespace chrono {
+    // using std::chrono::parse;
+
+    // calendrical constants
+    using std::chrono::last;
+
+    using std::chrono::Friday;
+    using std::chrono::Monday;
+    using std::chrono::Saturday;
+    using std::chrono::Sunday;
+    using std::chrono::Thursday;
+    using std::chrono::Tuesday;
+    using std::chrono::Wednesday;
+
+    using std::chrono::April;
+    using std::chrono::August;
+    using std::chrono::December;
+    using std::chrono::February;
+    using std::chrono::January;
+    using std::chrono::July;
+    using std::chrono::June;
+    using std::chrono::March;
+    using std::chrono::May;
+    using std::chrono::November;
+    using std::chrono::October;
+    using std::chrono::September;
+
+  } // namespace chrono
+
+} // namespace std
+export namespace std::inline literals::inline chrono_literals {
+  // [time.duration.literals], suffixes for duration literals
+  using std::literals::chrono_literals::operator""h;
+  using std::literals::chrono_literals::operator""min;
+  using std::literals::chrono_literals::operator""s;
+  using std::literals::chrono_literals::operator""ms;
+  using std::literals::chrono_literals::operator""us;
+  using std::literals::chrono_literals::operator""ns;
+
+  // [using std::literals::chrono_literals::.cal.day.nonmembers], non-member functions
+  using std::literals::chrono_literals::operator""d;
+
+  // [using std::literals::chrono_literals::.cal.year.nonmembers], non-member functions
+  using std::literals::chrono_literals::operator""y;
+} // namespace std::inline literals::inline chrono_literals