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 // Copyright 2018 The Abseil Authors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //      https://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 //
 // -----------------------------------------------------------------------------
 // File: civil_time.h
 // -----------------------------------------------------------------------------
 //
 // This header file defines abstractions for computing with "civil time".
 // The term "civil time" refers to the legally recognized human-scale time
 // that is represented by the six fields `YYYY-MM-DD hh:mm:ss`. A "date"
 // is perhaps the most common example of a civil time (represented here as
 // an `absl::CivilDay`).
 //
 // Modern-day civil time follows the Gregorian Calendar and is a
 // time-zone-independent concept: a civil time of "2015-06-01 12:00:00", for
 // example, is not tied to a time zone. Put another way, a civil time does not
 // map to a unique point in time; a civil time must be mapped to an absolute
 // time *through* a time zone.
 //
 // Because a civil time is what most people think of as "time," it is common to
 // map absolute times to civil times to present to users.
 //
 // Time zones define the relationship between absolute and civil times. Given an
 // absolute or civil time and a time zone, you can compute the other time:
 //
 //   Civil Time = F(Absolute Time, Time Zone)
 //   Absolute Time = G(Civil Time, Time Zone)
 //
 // The Abseil time library allows you to construct such civil times from
 // absolute times; consult time.h for such functionality.
 //
 // This library provides six classes for constructing civil-time objects, and
 // provides several helper functions for rounding, iterating, and performing
 // arithmetic on civil-time objects, while avoiding complications like
 // daylight-saving time (DST):
 //
 //   * `absl::CivilSecond`
 //   * `absl::CivilMinute`
 //   * `absl::CivilHour`
 //   * `absl::CivilDay`
 //   * `absl::CivilMonth`
 //   * `absl::CivilYear`
 //
 // Example:
 //
 //   // Construct a civil-time object for a specific day
 //   const absl::CivilDay cd(1969, 07, 20);
 //
 //   // Construct a civil-time object for a specific second
 //   const absl::CivilSecond cd(2018, 8, 1, 12, 0, 1);
 //
 // Note: In C++14 and later, this library is usable in a constexpr context.
 //
 // Example:
 //
 //   // Valid in C++14
 //   constexpr absl::CivilDay cd(1969, 07, 20);
 
 #ifndef ABSL_TIME_CIVIL_TIME_H_
 #define ABSL_TIME_CIVIL_TIME_H_
 
 #include <iosfwd>
 #include <string>
 
 #include "absl/base/config.h"
 #include "absl/strings/string_view.h"
 #include "absl/time/internal/cctz/include/cctz/civil_time.h"
 
 namespace absl {
 ABSL_NAMESPACE_BEGIN
 
 namespace time_internal {
 struct second_tag : cctz::detail::second_tag {};
 struct minute_tag : second_tag, cctz::detail::minute_tag {};
 struct hour_tag : minute_tag, cctz::detail::hour_tag {};
 struct day_tag : hour_tag, cctz::detail::day_tag {};
 struct month_tag : day_tag, cctz::detail::month_tag {};
 struct year_tag : month_tag, cctz::detail::year_tag {};
 }  // namespace time_internal
 
 // -----------------------------------------------------------------------------
 // CivilSecond, CivilMinute, CivilHour, CivilDay, CivilMonth, CivilYear
 // -----------------------------------------------------------------------------
 //
 // Each of these civil-time types is a simple value type with the same
 // interface for construction and the same six accessors for each of the civil
 // time fields (year, month, day, hour, minute, and second, aka YMDHMS). These
 // classes differ only in their alignment, which is indicated by the type name
 // and specifies the field on which arithmetic operates.
 //
 // CONSTRUCTION
 //
 // Each of the civil-time types can be constructed in two ways: by directly
 // passing to the constructor up to six integers representing the YMDHMS fields,
 // or by copying the YMDHMS fields from a differently aligned civil-time type.
 // Omitted fields are assigned their minimum valid value. Hours, minutes, and
 // seconds will be set to 0, month and day will be set to 1. Since there is no
 // minimum year, the default is 1970.
 //
 // Examples:
 //
 //   absl::CivilDay default_value;               // 1970-01-01 00:00:00
 //
 //   absl::CivilDay a(2015, 2, 3);               // 2015-02-03 00:00:00
 //   absl::CivilDay b(2015, 2, 3, 4, 5, 6);      // 2015-02-03 00:00:00
 //   absl::CivilDay c(2015);                     // 2015-01-01 00:00:00
 //
 //   absl::CivilSecond ss(2015, 2, 3, 4, 5, 6);  // 2015-02-03 04:05:06
 //   absl::CivilMinute mm(ss);                   // 2015-02-03 04:05:00
 //   absl::CivilHour hh(mm);                     // 2015-02-03 04:00:00
 //   absl::CivilDay d(hh);                       // 2015-02-03 00:00:00
 //   absl::CivilMonth m(d);                      // 2015-02-01 00:00:00
 //   absl::CivilYear y(m);                       // 2015-01-01 00:00:00
 //
 //   m = absl::CivilMonth(y);                    // 2015-01-01 00:00:00
 //   d = absl::CivilDay(m);                      // 2015-01-01 00:00:00
 //   hh = absl::CivilHour(d);                    // 2015-01-01 00:00:00
 //   mm = absl::CivilMinute(hh);                 // 2015-01-01 00:00:00
 //   ss = absl::CivilSecond(mm);                 // 2015-01-01 00:00:00
 //
 // Each civil-time class is aligned to the civil-time field indicated in the
 // class's name after normalization. Alignment is performed by setting all the
 // inferior fields to their minimum valid value (as described above). The
 // following are examples of how each of the six types would align the fields
 // representing November 22, 2015 at 12:34:56 in the afternoon. (Note: the
 // string format used here is not important; it's just a shorthand way of
 // showing the six YMDHMS fields.)
 //
 //   absl::CivilSecond   : 2015-11-22 12:34:56
 //   absl::CivilMinute   : 2015-11-22 12:34:00
 //   absl::CivilHour     : 2015-11-22 12:00:00
 //   absl::CivilDay      : 2015-11-22 00:00:00
 //   absl::CivilMonth    : 2015-11-01 00:00:00
 //   absl::CivilYear     : 2015-01-01 00:00:00
 //
 // Each civil-time type performs arithmetic on the field to which it is
 // aligned. This means that adding 1 to an absl::CivilDay increments the day
 // field (normalizing as necessary), and subtracting 7 from an absl::CivilMonth
 // operates on the month field (normalizing as necessary). All arithmetic
 // produces a valid civil time. Difference requires two similarly aligned
 // civil-time objects and returns the scalar answer in units of the objects'
 // alignment. For example, the difference between two absl::CivilHour objects
 // will give an answer in units of civil hours.
 //
 // ALIGNMENT CONVERSION
 //
 // The alignment of a civil-time object cannot change, but the object may be
 // used to construct a new object with a different alignment. This is referred
 // to as "realigning". When realigning to a type with the same or more
 // precision (e.g., absl::CivilDay -> absl::CivilSecond), the conversion may be
 // performed implicitly since no information is lost. However, if information
 // could be discarded (e.g., CivilSecond -> CivilDay), the conversion must
 // be explicit at the call site.
 //
 // Examples:
 //
 //   void UseDay(absl::CivilDay day);
 //
 //   absl::CivilSecond cs;
 //   UseDay(cs);                  // Won't compile because data may be discarded
 //   UseDay(absl::CivilDay(cs));  // OK: explicit conversion
 //
 //   absl::CivilDay cd;
 //   UseDay(cd);                  // OK: no conversion needed
 //
 //   absl::CivilMonth cm;
 //   UseDay(cm);                  // OK: implicit conversion to absl::CivilDay
 //
 // NORMALIZATION
 //
 // Normalization takes invalid values and adjusts them to produce valid values.
 // Within the civil-time library, integer arguments passed to the Civil*
 // constructors may be out-of-range, in which case they are normalized by
 // carrying overflow into a field of courser granularity to produce valid
 // civil-time objects. This normalization enables natural arithmetic on
 // constructor arguments without worrying about the field's range.
 //
 // Examples:
 //
 //   // Out-of-range; normalized to 2016-11-01
 //   absl::CivilDay d(2016, 10, 32);
 //   // Out-of-range, negative: normalized to 2016-10-30T23
 //   absl::CivilHour h1(2016, 10, 31, -1);
 //   // Normalization is cumulative: normalized to 2016-10-30T23
 //   absl::CivilHour h2(2016, 10, 32, -25);
 //
 // Note: If normalization is undesired, you can signal an error by comparing
 // the constructor arguments to the normalized values returned by the YMDHMS
 // properties.
 //
 // COMPARISON
 //
 // Comparison between civil-time objects considers all six YMDHMS fields,
 // regardless of the type's alignment. Comparison between differently aligned
 // civil-time types is allowed.
 //
 // Examples:
 //
 //   absl::CivilDay feb_3(2015, 2, 3);  // 2015-02-03 00:00:00
 //   absl::CivilDay mar_4(2015, 3, 4);  // 2015-03-04 00:00:00
 //   // feb_3 < mar_4
 //   // absl::CivilYear(feb_3) == absl::CivilYear(mar_4)
 //
 //   absl::CivilSecond feb_3_noon(2015, 2, 3, 12, 0, 0);  // 2015-02-03 12:00:00
 //   // feb_3 < feb_3_noon
 //   // feb_3 == absl::CivilDay(feb_3_noon)
 //
 //   // Iterates all the days of February 2015.
 //   for (absl::CivilDay d(2015, 2, 1); d < absl::CivilMonth(2015, 3); ++d) {
 //     // ...
 //   }
 //
 // ARITHMETIC
 //
 // Civil-time types support natural arithmetic operators such as addition,
 // subtraction, and difference. Arithmetic operates on the civil-time field
 // indicated in the type's name. Difference operators require arguments with
 // the same alignment and return the answer in units of the alignment.
 //
 // Example:
 //
 //   absl::CivilDay a(2015, 2, 3);
 //   ++a;                              // 2015-02-04 00:00:00
 //   --a;                              // 2015-02-03 00:00:00
 //   absl::CivilDay b = a + 1;         // 2015-02-04 00:00:00
 //   absl::CivilDay c = 1 + b;         // 2015-02-05 00:00:00
 //   int n = c - a;                    // n = 2 (civil days)
 //   int m = c - absl::CivilMonth(c);  // Won't compile: different types.
 //
 // ACCESSORS
 //
 // Each civil-time type has accessors for all six of the civil-time fields:
 // year, month, day, hour, minute, and second.
 //
 // civil_year_t year()
 // int          month()
 // int          day()
 // int          hour()
 // int          minute()
 // int          second()
 //
 // Recall that fields inferior to the type's alignment will be set to their
 // minimum valid value.
 //
 // Example:
 //
 //   absl::CivilDay d(2015, 6, 28);
 //   // d.year() == 2015
 //   // d.month() == 6
 //   // d.day() == 28
 //   // d.hour() == 0
 //   // d.minute() == 0
 //   // d.second() == 0
 //
 // CASE STUDY: Adding a month to January 31.
 //
 // One of the classic questions that arises when considering a civil time
 // library (or a date library or a date/time library) is this:
 //   "What is the result of adding a month to January 31?"
 // This is an interesting question because it is unclear what is meant by a
 // "month", and several different answers are possible, depending on context:
 //
 //   1. March 3 (or 2 if a leap year), if "add a month" means to add a month to
 //      the current month, and adjust the date to overflow the extra days into
 //      March. In this case the result of "February 31" would be normalized as
 //      within the civil-time library.
 //   2. February 28 (or 29 if a leap year), if "add a month" means to add a
 //      month, and adjust the date while holding the resulting month constant.
 //      In this case, the result of "February 31" would be truncated to the last
 //      day in February.
 //   3. An error. The caller may get some error, an exception, an invalid date
 //      object, or perhaps return `false`. This may make sense because there is
 //      no single unambiguously correct answer to the question.
 //
 // Practically speaking, any answer that is not what the programmer intended
 // is the wrong answer.
 //
 // The Abseil time library avoids this problem by making it impossible to
 // ask ambiguous questions. All civil-time objects are aligned to a particular
 // civil-field boundary (such as aligned to a year, month, day, hour, minute,
 // or second), and arithmetic operates on the field to which the object is
 // aligned. This means that in order to "add a month" the object must first be
 // aligned to a month boundary, which is equivalent to the first day of that
 // month.
 //
 // Of course, there are ways to compute an answer the question at hand using
 // this Abseil time library, but they require the programmer to be explicit
 // about the answer they expect. To illustrate, let's see how to compute all
 // three of the above possible answers to the question of "Jan 31 plus 1
 // month":
 //
 // Example:
 //
 //   const absl::CivilDay d(2015, 1, 31);
 //
 //   // Answer 1:
 //   // Add 1 to the month field in the constructor, and rely on normalization.
 //   const auto normalized = absl::CivilDay(d.year(), d.month() + 1, d.day());
 //   // normalized == 2015-03-03 (aka Feb 31)
 //
 //   // Answer 2:
 //   // Add 1 to month field, capping to the end of next month.
 //   const auto next_month = absl::CivilMonth(d) + 1;
 //   const auto last_day_of_next_month = absl::CivilDay(next_month + 1) - 1;
 //   const auto capped = std::min(normalized, last_day_of_next_month);
 //   // capped == 2015-02-28
 //
 //   // Answer 3:
 //   // Signal an error if the normalized answer is not in next month.
 //   if (absl::CivilMonth(normalized) != next_month) {
 //     // error, month overflow
 //   }
 //
 using CivilSecond =
     time_internal::cctz::detail::civil_time<time_internal::second_tag>;
 using CivilMinute =
     time_internal::cctz::detail::civil_time<time_internal::minute_tag>;
 using CivilHour =
     time_internal::cctz::detail::civil_time<time_internal::hour_tag>;
 using CivilDay =
     time_internal::cctz::detail::civil_time<time_internal::day_tag>;
 using CivilMonth =
     time_internal::cctz::detail::civil_time<time_internal::month_tag>;
 using CivilYear =
     time_internal::cctz::detail::civil_time<time_internal::year_tag>;
 
 // civil_year_t
 //
 // Type alias of a civil-time year value. This type is guaranteed to (at least)
 // support any year value supported by `time_t`.
 //
 // Example:
 //
 //   absl::CivilSecond cs = ...;
 //   absl::civil_year_t y = cs.year();
 //   cs = absl::CivilSecond(y, 1, 1, 0, 0, 0);  // CivilSecond(CivilYear(cs))
 //
 using civil_year_t = time_internal::cctz::year_t;
 
 // civil_diff_t
 //
 // Type alias of the difference between two civil-time values.
 // This type is used to indicate arguments that are not
 // normalized (such as parameters to the civil-time constructors), the results
 // of civil-time subtraction, or the operand to civil-time addition.
 //
 // Example:
 //
 //   absl::civil_diff_t n_sec = cs1 - cs2;             // cs1 == cs2 + n_sec;
 //
 using civil_diff_t = time_internal::cctz::diff_t;
 
 // Weekday::monday, Weekday::tuesday, Weekday::wednesday, Weekday::thursday,
 // Weekday::friday, Weekday::saturday, Weekday::sunday
 //
 // The Weekday enum class represents the civil-time concept of a "weekday" with
 // members for all days of the week.
 //
 //   absl::Weekday wd = absl::Weekday::thursday;
 //
 using Weekday = time_internal::cctz::weekday;
 
 // GetWeekday()
 //
 // Returns the absl::Weekday for the given (realigned) civil-time value.
 //
 // Example:
 //
 //   absl::CivilDay a(2015, 8, 13);
 //   absl::Weekday wd = absl::GetWeekday(a);  // wd == absl::Weekday::thursday
 //
 inline Weekday GetWeekday(CivilSecond cs) {
   return time_internal::cctz::get_weekday(cs);
 }
 
 // NextWeekday()
 // PrevWeekday()
 //
 // Returns the absl::CivilDay that strictly follows or precedes a given
 // absl::CivilDay, and that falls on the given absl::Weekday.
 //
 // Example, given the following month:
 //
 //       August 2015
 //   Su Mo Tu We Th Fr Sa
 //                      1
 //    2  3  4  5  6  7  8
 //    9 10 11 12 13 14 15
 //   16 17 18 19 20 21 22
 //   23 24 25 26 27 28 29
 //   30 31
 //
 //   absl::CivilDay a(2015, 8, 13);
 //   // absl::GetWeekday(a) == absl::Weekday::thursday
 //   absl::CivilDay b = absl::NextWeekday(a, absl::Weekday::thursday);
 //   // b = 2015-08-20
 //   absl::CivilDay c = absl::PrevWeekday(a, absl::Weekday::thursday);
 //   // c = 2015-08-06
 //
 //   absl::CivilDay d = ...
 //   // Gets the following Thursday if d is not already Thursday
 //   absl::CivilDay thurs1 = absl::NextWeekday(d - 1, absl::Weekday::thursday);
 //   // Gets the previous Thursday if d is not already Thursday
 //   absl::CivilDay thurs2 = absl::PrevWeekday(d + 1, absl::Weekday::thursday);
 //
 inline CivilDay NextWeekday(CivilDay cd, Weekday wd) {
   return CivilDay(time_internal::cctz::next_weekday(cd, wd));
 }
 inline CivilDay PrevWeekday(CivilDay cd, Weekday wd) {
   return CivilDay(time_internal::cctz::prev_weekday(cd, wd));
 }
 
 // GetYearDay()
 //
 // Returns the day-of-year for the given (realigned) civil-time value.
 //
 // Example:
 //
 //   absl::CivilDay a(2015, 1, 1);
 //   int yd_jan_1 = absl::GetYearDay(a);   // yd_jan_1 = 1
 //   absl::CivilDay b(2015, 12, 31);
 //   int yd_dec_31 = absl::GetYearDay(b);  // yd_dec_31 = 365
 //
 inline int GetYearDay(CivilSecond cs) {
   return time_internal::cctz::get_yearday(cs);
 }
 
 // FormatCivilTime()
 //
 // Formats the given civil-time value into a string value of the following
 // format:
 //
 //  Type        | Format
 //  ---------------------------------
 //  CivilSecond | YYYY-MM-DDTHH:MM:SS
 //  CivilMinute | YYYY-MM-DDTHH:MM
 //  CivilHour   | YYYY-MM-DDTHH
 //  CivilDay    | YYYY-MM-DD
 //  CivilMonth  | YYYY-MM
 //  CivilYear   | YYYY
 //
 // Example:
 //
 //   absl::CivilDay d = absl::CivilDay(1969, 7, 20);
 //   std::string day_string = absl::FormatCivilTime(d);  // "1969-07-20"
 //
 std::string FormatCivilTime(CivilSecond c);
 std::string FormatCivilTime(CivilMinute c);
 std::string FormatCivilTime(CivilHour c);
 std::string FormatCivilTime(CivilDay c);
 std::string FormatCivilTime(CivilMonth c);
 std::string FormatCivilTime(CivilYear c);
 
 // Support for StrFormat(), StrCat(), etc
 template <typename Sink>
 void AbslStringify(Sink& sink, CivilSecond c) {
   sink.Append(FormatCivilTime(c));
 }
 template <typename Sink>
 void AbslStringify(Sink& sink, CivilMinute c) {
   sink.Append(FormatCivilTime(c));
 }
 template <typename Sink>
 void AbslStringify(Sink& sink, CivilHour c) {
   sink.Append(FormatCivilTime(c));
 }
 template <typename Sink>
 void AbslStringify(Sink& sink, CivilDay c) {
   sink.Append(FormatCivilTime(c));
 }
 template <typename Sink>
 void AbslStringify(Sink& sink, CivilMonth c) {
   sink.Append(FormatCivilTime(c));
 }
 template <typename Sink>
 void AbslStringify(Sink& sink, CivilYear c) {
   sink.Append(FormatCivilTime(c));
 }
 
 // absl::ParseCivilTime()
 //
 // Parses a civil-time value from the specified `absl::string_view` into the
 // passed output parameter. Returns `true` upon successful parsing.
 //
 // The expected form of the input string is as follows:
 //
 //  Type        | Format
 //  ---------------------------------
 //  CivilSecond | YYYY-MM-DDTHH:MM:SS
 //  CivilMinute | YYYY-MM-DDTHH:MM
 //  CivilHour   | YYYY-MM-DDTHH
 //  CivilDay    | YYYY-MM-DD
 //  CivilMonth  | YYYY-MM
 //  CivilYear   | YYYY
 //
 // Example:
 //
 //   absl::CivilDay d;
 //   bool ok = absl::ParseCivilTime("2018-01-02", &d); // OK
 //
 // Note that parsing will fail if the string's format does not match the
 // expected type exactly. `ParseLenientCivilTime()` below is more lenient.
 //
 bool ParseCivilTime(absl::string_view s, CivilSecond* c);
 bool ParseCivilTime(absl::string_view s, CivilMinute* c);
 bool ParseCivilTime(absl::string_view s, CivilHour* c);
 bool ParseCivilTime(absl::string_view s, CivilDay* c);
 bool ParseCivilTime(absl::string_view s, CivilMonth* c);
 bool ParseCivilTime(absl::string_view s, CivilYear* c);
 
 // ParseLenientCivilTime()
 //
 // Parses any of the formats accepted by `absl::ParseCivilTime()`, but is more
 // lenient if the format of the string does not exactly match the associated
 // type.
 //
 // Example:
 //
 //   absl::CivilDay d;
 //   bool ok = absl::ParseLenientCivilTime("1969-07-20", &d); // OK
 //   ok = absl::ParseLenientCivilTime("1969-07-20T10", &d);   // OK: T10 floored
 //   ok = absl::ParseLenientCivilTime("1969-07", &d);   // OK: day defaults to 1
 //
 bool ParseLenientCivilTime(absl::string_view s, CivilSecond* c);
 bool ParseLenientCivilTime(absl::string_view s, CivilMinute* c);
 bool ParseLenientCivilTime(absl::string_view s, CivilHour* c);
 bool ParseLenientCivilTime(absl::string_view s, CivilDay* c);
 bool ParseLenientCivilTime(absl::string_view s, CivilMonth* c);
 bool ParseLenientCivilTime(absl::string_view s, CivilYear* c);
 
 namespace time_internal {  // For functions found via ADL on civil-time tags.
 
 // Streaming Operators
 //
 // Each civil-time type may be sent to an output stream using operator<<().
 // The result matches the string produced by `FormatCivilTime()`.
 //
 // Example:
 //
 //   absl::CivilDay d = absl::CivilDay(1969, 7, 20);
 //   std::cout << "Date is: " << d << "\n";
 //
 std::ostream& operator<<(std::ostream& os, CivilYear y);
 std::ostream& operator<<(std::ostream& os, CivilMonth m);
 std::ostream& operator<<(std::ostream& os, CivilDay d);
 std::ostream& operator<<(std::ostream& os, CivilHour h);
 std::ostream& operator<<(std::ostream& os, CivilMinute m);
 std::ostream& operator<<(std::ostream& os, CivilSecond s);
 
 // AbslParseFlag()
 //
 // Parses the command-line flag string representation `s` into a civil-time
 // value. Flags must be specified in a format that is valid for
 // `absl::ParseLenientCivilTime()`.
 bool AbslParseFlag(absl::string_view s, CivilSecond* c, std::string* error);
 bool AbslParseFlag(absl::string_view s, CivilMinute* c, std::string* error);
 bool AbslParseFlag(absl::string_view s, CivilHour* c, std::string* error);
 bool AbslParseFlag(absl::string_view s, CivilDay* c, std::string* error);
 bool AbslParseFlag(absl::string_view s, CivilMonth* c, std::string* error);
 bool AbslParseFlag(absl::string_view s, CivilYear* c, std::string* error);
 
 // AbslUnparseFlag()
 //
 // Unparses a civil-time value into a command-line string representation using
 // the format specified by `absl::ParseCivilTime()`.
 std::string AbslUnparseFlag(CivilSecond c);
 std::string AbslUnparseFlag(CivilMinute c);
 std::string AbslUnparseFlag(CivilHour c);
 std::string AbslUnparseFlag(CivilDay c);
 std::string AbslUnparseFlag(CivilMonth c);
 std::string AbslUnparseFlag(CivilYear c);
 
 }  // namespace time_internal
 
 ABSL_NAMESPACE_END
 }  // namespace absl
 
 #endif  // ABSL_TIME_CIVIL_TIME_H_

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