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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/LocalDateTime.h
downloadydb-1110808a9d39d4b808aef724c861a2e1a38d2a69.tar.gz
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+//
+// LocalDateTime.h
+//
+// Library: Foundation
+// Package: DateTime
+// Module: LocalDateTime
+//
+// Definition of the LocalDateTime class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier: BSL-1.0
+//
+
+
+#ifndef Foundation_LocalDateTime_INCLUDED
+#define Foundation_LocalDateTime_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/DateTime.h"
+
+
+namespace Poco {
+
+
+class Foundation_API LocalDateTime
+ /// This class represents an instant in local time
+ /// (as opposed to UTC), expressed in years, months, days,
+ /// hours, minutes, seconds and milliseconds based on the
+ /// Gregorian calendar.
+ ///
+ /// In addition to the date and time, the class also
+ /// maintains a time zone differential, which denotes
+ /// the difference in seconds from UTC to local time,
+ /// i.e. UTC = local time - time zone differential.
+ ///
+ /// Although LocalDateTime supports relational and arithmetic
+ /// operators, all date/time comparisons and date/time arithmetics
+ /// should be done in UTC, using the DateTime or Timestamp
+ /// class for better performance. The relational operators
+ /// normalize the dates/times involved to UTC before carrying out
+ /// the comparison.
+ ///
+ /// The time zone differential is based on the input date and
+ /// time and current time zone. A number of constructors accept
+ /// an explicit time zone differential parameter. These should
+ /// not be used since daylight savings time processing is impossible
+ /// since the time zone is unknown. Each of the constructors
+ /// accepting a tzd parameter have been marked as deprecated and
+ /// may be removed in a future revision.
+{
+public:
+ LocalDateTime();
+ /// Creates a LocalDateTime with the current date/time
+ /// for the current time zone.
+
+ LocalDateTime(int year, int month, int day, int hour = 0, int minute = 0, int second = 0, int millisecond = 0, int microsecond = 0);
+ /// Creates a LocalDateTime for the given Gregorian local 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.
+
+ //@ deprecated
+ LocalDateTime(int tzd, int year, int month, int day, int hour, int minute, int second, int millisecond, int microsecond);
+ /// Creates a LocalDateTime for the given Gregorian date and time in the
+ /// time zone denoted by the time zone differential in tzd.
+ /// * tzd is in seconds.
+ /// * 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.
+
+ LocalDateTime(const DateTime& dateTime);
+ /// Creates a LocalDateTime from the UTC time given in dateTime,
+ /// using the time zone differential of the current time zone.
+
+ //@ deprecated
+ LocalDateTime(int tzd, const DateTime& dateTime);
+ /// Creates a LocalDateTime from the UTC time given in dateTime,
+ /// using the given time zone differential. Adjusts dateTime
+ /// for the given time zone differential.
+
+ //@ deprecated
+ LocalDateTime(int tzd, const DateTime& dateTime, bool adjust);
+ /// Creates a LocalDateTime from the UTC time given in dateTime,
+ /// using the given time zone differential. If adjust is true,
+ /// adjusts dateTime for the given time zone differential.
+
+ LocalDateTime(double julianDay);
+ /// Creates a LocalDateTime for the given Julian day in the local time zone.
+
+ //@ deprecated
+ LocalDateTime(int tzd, double julianDay);
+ /// Creates a LocalDateTime for the given Julian day in the time zone
+ /// denoted by the time zone differential in tzd.
+
+ LocalDateTime(const LocalDateTime& dateTime);
+ /// Copy constructor. Creates the LocalDateTime from another one.
+
+ ~LocalDateTime();
+ /// Destroys the LocalDateTime.
+
+ LocalDateTime& operator = (const LocalDateTime& dateTime);
+ /// Assigns another LocalDateTime.
+
+ LocalDateTime& operator = (const Timestamp& timestamp);
+ /// Assigns a timestamp
+
+ LocalDateTime& operator = (double julianDay);
+ /// Assigns a Julian day in the local time zone.
+
+ LocalDateTime& 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 local 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.
+
+ //@ deprecated
+ LocalDateTime& assign(int tzd, int year, int month, int day, int hour, int minute, int second, int millisecond, int microseconds);
+ /// Assigns a Gregorian local date and time in the time zone denoted by
+ /// the time zone differential in tzd.
+ /// * tzd is in seconds.
+ /// * 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.
+
+ //@ deprecated
+ LocalDateTime& assign(int tzd, double julianDay);
+ /// Assigns a Julian day in the time zone denoted by the
+ /// time zone differential in tzd.
+
+ void swap(LocalDateTime& dateTime);
+ /// Swaps the LocalDateTime with another one.
+
+ int year() const;
+ /// Returns the year.
+
+ int month() const;
+ /// Returns the month (1 to 12).
+
+ int week(int firstDayOfWeek = DateTime::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.
+
+ int tzd() const;
+ /// Returns the time zone differential.
+
+ DateTime utc() const;
+ /// Returns the UTC equivalent for the local date and time.
+
+ Timestamp timestamp() const;
+ /// Returns the date and time expressed as a Timestamp.
+
+ Timestamp::UtcTimeVal utcTime() const;
+ /// Returns the UTC equivalent for the local date and time.
+
+ bool operator == (const LocalDateTime& dateTime) const;
+ bool operator != (const LocalDateTime& dateTime) const;
+ bool operator < (const LocalDateTime& dateTime) const;
+ bool operator <= (const LocalDateTime& dateTime) const;
+ bool operator > (const LocalDateTime& dateTime) const;
+ bool operator >= (const LocalDateTime& dateTime) const;
+
+ LocalDateTime operator + (const Timespan& span) const;
+ LocalDateTime operator - (const Timespan& span) const;
+ Timespan operator - (const LocalDateTime& dateTime) const;
+ LocalDateTime& operator += (const Timespan& span);
+ LocalDateTime& operator -= (const Timespan& span);
+
+protected:
+ LocalDateTime(Timestamp::UtcTimeVal utcTime, Timestamp::TimeDiff diff, int tzd);
+
+ void determineTzd(bool adjust = false);
+ /// Recalculate the tzd based on the _dateTime member based
+ /// on the current timezone using the Standard C runtime functions.
+ /// If adjust is true, then adjustForTzd() is called after the
+ /// differential is calculated.
+
+ void adjustForTzd();
+ /// Adjust the _dateTime member based on the _tzd member.
+
+ std::time_t dstOffset(int& dstOffset) const;
+ /// Determine the DST offset for the current date/time.
+
+private:
+ DateTime _dateTime;
+ int _tzd;
+
+ friend class DateTimeFormatter;
+ friend class DateTimeParser;
+};
+
+
+//
+// inlines
+//
+inline int LocalDateTime::year() const
+{
+ return _dateTime.year();
+}
+
+
+inline int LocalDateTime::month() const
+{
+ return _dateTime.month();
+}
+
+
+inline int LocalDateTime::week(int firstDayOfWeek) const
+{
+ return _dateTime.week(firstDayOfWeek);
+}
+
+
+inline int LocalDateTime::day() const
+{
+ return _dateTime.day();
+}
+
+
+inline int LocalDateTime::dayOfWeek() const
+{
+ return _dateTime.dayOfWeek();
+}
+
+
+inline int LocalDateTime::dayOfYear() const
+{
+ return _dateTime.dayOfYear();
+}
+
+
+inline int LocalDateTime::hour() const
+{
+ return _dateTime.hour();
+}
+
+
+inline int LocalDateTime::hourAMPM() const
+{
+ return _dateTime.hourAMPM();
+}
+
+
+inline bool LocalDateTime::isAM() const
+{
+ return _dateTime.isAM();
+}
+
+
+inline bool LocalDateTime::isPM() const
+{
+ return _dateTime.isPM();
+}
+
+
+inline int LocalDateTime::minute() const
+{
+ return _dateTime.minute();
+}
+
+
+inline int LocalDateTime::second() const
+{
+ return _dateTime.second();
+}
+
+
+inline int LocalDateTime::millisecond() const
+{
+ return _dateTime.millisecond();
+}
+
+
+inline int LocalDateTime::microsecond() const
+{
+ return _dateTime.microsecond();
+}
+
+
+inline double LocalDateTime::julianDay() const
+{
+ return _dateTime.julianDay();
+}
+
+
+inline int LocalDateTime::tzd() const
+{
+ return _tzd;
+}
+
+
+inline Timestamp LocalDateTime::timestamp() const
+{
+ return Timestamp::fromUtcTime(_dateTime.utcTime());
+}
+
+
+inline Timestamp::UtcTimeVal LocalDateTime::utcTime() const
+{
+ return _dateTime.utcTime() - ((Timestamp::TimeDiff) _tzd)*10000000;
+}
+
+
+inline void LocalDateTime::adjustForTzd()
+{
+ _dateTime += Timespan(((Timestamp::TimeDiff) _tzd)*Timespan::SECONDS);
+}
+
+
+inline void swap(LocalDateTime& d1, LocalDateTime& d2)
+{
+ d1.swap(d2);
+}
+
+
+} // namespace Poco
+
+
+#endif // Foundation_LocalDateTime_INCLUDED