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authorDevtools Arcadia <arcadia-devtools@yandex-team.ru>2022-02-07 18:08:42 +0300
committerDevtools Arcadia <arcadia-devtools@mous.vla.yp-c.yandex.net>2022-02-07 18:08:42 +0300
commit1110808a9d39d4b808aef724c861a2e1a38d2a69 (patch)
treee26c9fed0de5d9873cce7e00bc214573dc2195b7 /contrib/libs/poco/Foundation/include/Poco/DateTime.h
downloadydb-1110808a9d39d4b808aef724c861a2e1a38d2a69.tar.gz
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+//
+// DateTime.h
+//
+// Library: Foundation
+// Package: DateTime
+// Module: DateTime
+//
+// Definition of the DateTime class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier: BSL-1.0
+//
+
+
+#ifndef Foundation_DateTime_INCLUDED
+#define Foundation_DateTime_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/Timestamp.h"
+#include "Poco/Timespan.h"
+
+
+namespace Poco {
+
+
+class Foundation_API DateTime
+ /// This class represents an instant in time, expressed
+ /// in years, months, days, hours, minutes, seconds
+ /// and milliseconds based on the Gregorian calendar.
+ /// The class is mainly useful for conversions between
+ /// UTC, Julian day and Gregorian calendar dates.
+ ///
+ /// The date and time stored in a DateTime is always in UTC
+ /// (Coordinated Universal Time) and thus independent of the
+ /// timezone in effect on the system.
+ ///
+ /// Conversion calculations are based on algorithms
+ /// collected and described by Peter Baum at
+ /// http://vsg.cape.com/~pbaum/date/date0.htm
+ ///
+ /// Internally, this class stores a date/time in two
+ /// forms (UTC and broken down) for performance reasons. Only use
+ /// this class for conversions between date/time representations.
+ /// Use the Timestamp class for everything else.
+ ///
+ /// Notes:
+ /// * Zero is a valid year (in accordance with ISO 8601 and astronomical year numbering)
+ /// * Year zero (0) is a leap year
+ /// * Negative years (years preceding 1 BC) are not supported
+ ///
+ /// For more information, please see:
+ /// * http://en.wikipedia.org/wiki/Gregorian_Calendar
+ /// * http://en.wikipedia.org/wiki/Julian_day
+ /// * http://en.wikipedia.org/wiki/UTC
+ /// * http://en.wikipedia.org/wiki/ISO_8601
+{
+public:
+ enum Months
+ /// Symbolic names for month numbers (1 to 12).
+ {
+ JANUARY = 1,
+ FEBRUARY,
+ MARCH,
+ APRIL,
+ MAY,
+ JUNE,
+ JULY,
+ AUGUST,
+ SEPTEMBER,
+ OCTOBER,
+ NOVEMBER,
+ DECEMBER
+ };
+
+ enum DaysOfWeek
+ /// Symbolic names for week day numbers (0 to 6).
+ {
+ SUNDAY = 0,
+ MONDAY,
+ TUESDAY,
+ WEDNESDAY,
+ THURSDAY,
+ FRIDAY,
+ SATURDAY
+ };
+
+ DateTime();
+ /// Creates a DateTime for the current date and time.
+
+ DateTime(const Timestamp& timestamp);
+ /// Creates a DateTime for the date and time given in
+ /// a Timestamp.
+
+ DateTime(int year, int month, int day, int hour = 0, int minute = 0, int second = 0, int millisecond = 0, int microsecond = 0);
+ /// Creates a DateTime for the given Gregorian date and time.
+ /// * year is from 0 to 9999.
+ /// * month is from 1 to 12.
+ /// * day is from 1 to 31.
+ /// * hour is from 0 to 23.
+ /// * minute is from 0 to 59.
+ /// * second is from 0 to 60 (allowing leap seconds).
+ /// * millisecond is from 0 to 999.
+ /// * microsecond is from 0 to 999.
+
+ DateTime(double julianDay);
+ /// Creates a DateTime for the given Julian day.
+
+ DateTime(Timestamp::UtcTimeVal utcTime, Timestamp::TimeDiff diff);
+ /// Creates a DateTime from an UtcTimeVal and a TimeDiff.
+ ///
+ /// Mainly used internally by DateTime and friends.
+
+ DateTime(const DateTime& dateTime);
+ /// Copy constructor. Creates the DateTime from another one.
+
+ ~DateTime();
+ /// Destroys the DateTime.
+
+ DateTime& operator = (const DateTime& dateTime);
+ /// Assigns another DateTime.
+
+ DateTime& operator = (const Timestamp& timestamp);
+ /// Assigns a Timestamp.
+
+ DateTime& operator = (double julianDay);
+ /// Assigns a Julian day.
+
+ DateTime& assign(int year, int month, int day, int hour = 0, int minute = 0, int second = 0, int millisecond = 0, int microseconds = 0);
+ /// Assigns a Gregorian date and time.
+ /// * year is from 0 to 9999.
+ /// * month is from 1 to 12.
+ /// * day is from 1 to 31.
+ /// * hour is from 0 to 23.
+ /// * minute is from 0 to 59.
+ /// * second is from 0 to 60 (allowing leap seconds).
+ /// * millisecond is from 0 to 999.
+ /// * microsecond is from 0 to 999.
+
+ void swap(DateTime& dateTime);
+ /// Swaps the DateTime with another one.
+
+ int year() const;
+ /// Returns the year.
+
+ int month() const;
+ /// Returns the month (1 to 12).
+
+ int week(int firstDayOfWeek = MONDAY) const;
+ /// Returns the week number within the year.
+ /// FirstDayOfWeek should be either SUNDAY (0) or MONDAY (1).
+ /// The returned week number will be from 0 to 53. Week number 1 is the week
+ /// containing January 4. This is in accordance to ISO 8601.
+ ///
+ /// The following example assumes that firstDayOfWeek is MONDAY. For 2005, which started
+ /// on a Saturday, week 1 will be the week starting on Monday, January 3.
+ /// January 1 and 2 will fall within week 0 (or the last week of the previous year).
+ ///
+ /// For 2007, which starts on a Monday, week 1 will be the week startung on Monday, January 1.
+ /// There will be no week 0 in 2007.
+
+ int day() const;
+ /// Returns the day witin the month (1 to 31).
+
+ int dayOfWeek() const;
+ /// Returns the weekday (0 to 6, where
+ /// 0 = Sunday, 1 = Monday, ..., 6 = Saturday).
+
+ int dayOfYear() const;
+ /// Returns the number of the day in the year.
+ /// January 1 is 1, February 1 is 32, etc.
+
+ int hour() const;
+ /// Returns the hour (0 to 23).
+
+ int hourAMPM() const;
+ /// Returns the hour (0 to 12).
+
+ bool isAM() const;
+ /// Returns true if hour < 12;
+
+ bool isPM() const;
+ /// Returns true if hour >= 12.
+
+ int minute() const;
+ /// Returns the minute (0 to 59).
+
+ int second() const;
+ /// Returns the second (0 to 59).
+
+ int millisecond() const;
+ /// Returns the millisecond (0 to 999)
+
+ int microsecond() const;
+ /// Returns the microsecond (0 to 999)
+
+ double julianDay() const;
+ /// Returns the julian day for the date and time.
+
+ Timestamp timestamp() const;
+ /// Returns the date and time expressed as a Timestamp.
+
+ Timestamp::UtcTimeVal utcTime() const;
+ /// Returns the date and time expressed in UTC-based
+ /// time. UTC base time is midnight, October 15, 1582.
+ /// Resolution is 100 nanoseconds.
+
+ bool operator == (const DateTime& dateTime) const;
+ bool operator != (const DateTime& dateTime) const;
+ bool operator < (const DateTime& dateTime) const;
+ bool operator <= (const DateTime& dateTime) const;
+ bool operator > (const DateTime& dateTime) const;
+ bool operator >= (const DateTime& dateTime) const;
+
+ DateTime operator + (const Timespan& span) const;
+ DateTime operator - (const Timespan& span) const;
+ Timespan operator - (const DateTime& dateTime) const;
+ DateTime& operator += (const Timespan& span);
+ DateTime& operator -= (const Timespan& span);
+
+ void makeUTC(int tzd);
+ /// Converts a local time into UTC, by applying the given time zone differential.
+
+ void makeLocal(int tzd);
+ /// Converts a UTC time into a local time, by applying the given time zone differential.
+
+ static bool isLeapYear(int year);
+ /// Returns true if the given year is a leap year;
+ /// false otherwise.
+
+ static int daysOfMonth(int year, int month);
+ /// Returns the number of days in the given month
+ /// and year. Month is from 1 to 12.
+
+ static bool isValid(int year, int month, int day, int hour = 0, int minute = 0, int second = 0, int millisecond = 0, int microsecond = 0);
+ /// Checks if the given date and time is valid
+ /// (all arguments are within a proper range).
+ ///
+ /// Returns true if all arguments are valid, false otherwise.
+
+protected:
+ static double toJulianDay(Timestamp::UtcTimeVal utcTime);
+ /// Computes the Julian day for an UTC time.
+
+ static double toJulianDay(int year, int month, int day, int hour = 0, int minute = 0, int second = 0, int millisecond = 0, int microsecond = 0);
+ /// Computes the Julian day for a gregorian calendar date and time.
+ /// See <http://vsg.cape.com/~pbaum/date/jdimp.htm>, section 2.3.1 for the algorithm.
+
+ static Timestamp::UtcTimeVal toUtcTime(double julianDay);
+ /// Computes the UTC time for a Julian day.
+
+ void computeGregorian(double julianDay);
+ /// Computes the Gregorian date for the given Julian day.
+ /// See <http://vsg.cape.com/~pbaum/date/injdimp.htm>, section 3.3.1 for the algorithm.
+
+ void computeDaytime();
+ /// Extracts the daytime (hours, minutes, seconds, etc.) from the stored utcTime.
+
+private:
+ void checkLimit(short& lower, short& higher, short limit);
+ void normalize();
+ ///utility functions used to correct the overflow in computeGregorian
+
+ Timestamp::UtcTimeVal _utcTime;
+ short _year;
+ short _month;
+ short _day;
+ short _hour;
+ short _minute;
+ short _second;
+ short _millisecond;
+ short _microsecond;
+};
+
+
+//
+// inlines
+//
+inline Timestamp DateTime::timestamp() const
+{
+ return Timestamp::fromUtcTime(_utcTime);
+}
+
+
+inline Timestamp::UtcTimeVal DateTime::utcTime() const
+{
+ return _utcTime;
+}
+
+
+inline int DateTime::year() const
+{
+ return _year;
+}
+
+
+inline int DateTime::month() const
+{
+ return _month;
+}
+
+
+inline int DateTime::day() const
+{
+ return _day;
+}
+
+
+inline int DateTime::hour() const
+{
+ return _hour;
+}
+
+
+inline int DateTime::hourAMPM() const
+{
+ if (_hour < 1)
+ return 12;
+ else if (_hour > 12)
+ return _hour - 12;
+ else
+ return _hour;
+}
+
+
+inline bool DateTime::isAM() const
+{
+ return _hour < 12;
+}
+
+
+inline bool DateTime::isPM() const
+{
+ return _hour >= 12;
+}
+
+
+inline int DateTime::minute() const
+{
+ return _minute;
+}
+
+
+inline int DateTime::second() const
+{
+ return _second;
+}
+
+
+inline int DateTime::millisecond() const
+{
+ return _millisecond;
+}
+
+
+inline int DateTime::microsecond() const
+{
+ return _microsecond;
+}
+
+
+inline bool DateTime::operator == (const DateTime& dateTime) const
+{
+ return _utcTime == dateTime._utcTime;
+}
+
+
+inline bool DateTime::operator != (const DateTime& dateTime) const
+{
+ return _utcTime != dateTime._utcTime;
+}
+
+
+inline bool DateTime::operator < (const DateTime& dateTime) const
+{
+ return _utcTime < dateTime._utcTime;
+}
+
+
+inline bool DateTime::operator <= (const DateTime& dateTime) const
+{
+ return _utcTime <= dateTime._utcTime;
+}
+
+
+inline bool DateTime::operator > (const DateTime& dateTime) const
+{
+ return _utcTime > dateTime._utcTime;
+}
+
+
+inline bool DateTime::operator >= (const DateTime& dateTime) const
+{
+ return _utcTime >= dateTime._utcTime;
+}
+
+
+inline bool DateTime::isLeapYear(int year)
+{
+ return (year % 4) == 0 && ((year % 100) != 0 || (year % 400) == 0);
+}
+
+
+inline void swap(DateTime& d1, DateTime& d2)
+{
+ d1.swap(d2);
+}
+
+
+} // namespace Poco
+
+
+#endif // Foundation_DateTime_INCLUDED