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391 lines
10 KiB
C++
391 lines
10 KiB
C++
//
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// LocalDateTime.h
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//
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// $Id: //poco/1.4/Foundation/include/Poco/LocalDateTime.h#1 $
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//
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// Library: Foundation
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// Package: DateTime
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// Module: LocalDateTime
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//
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// Definition of the LocalDateTime class.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Foundation_LocalDateTime_INCLUDED
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#define Foundation_LocalDateTime_INCLUDED
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#include "Poco/Foundation.h"
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#include "Poco/DateTime.h"
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namespace Poco {
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class Foundation_API LocalDateTime
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/// This class represents an instant in local time
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/// (as opposed to UTC), expressed in years, months, days,
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/// hours, minutes, seconds and milliseconds based on the
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/// Gregorian calendar.
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///
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/// In addition to the date and time, the class also
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/// maintains a time zone differential, which denotes
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/// the difference in seconds from UTC to local time,
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/// i.e. UTC = local time - time zone differential.
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///
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/// Although LocalDateTime supports relational and arithmetic
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/// operators, all date/time comparisons and date/time arithmetic
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/// should be done in UTC, using the DateTime or Timestamp
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/// class for better performance. The relational operators
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/// normalize the dates/times involved to UTC before carrying out
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/// the comparison.
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///
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/// The time zone differential is based on the input date and
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/// time and current time zone. A number of constructors accept
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/// an explicit time zone differential parameter. These should
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/// not be used since daylight savings time processing is impossible
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/// since the time zone is unknown. Each of the constructors
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/// accepting a tzd parameter have been marked as deprecated and
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/// may be removed in a future revision.
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{
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public:
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LocalDateTime();
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/// Creates a LocalDateTime with the current date/time
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/// for the current time zone.
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LocalDateTime(int year, int month, int day, int hour = 0, int minute = 0, int second = 0, int millisecond = 0, int microsecond = 0);
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/// Creates a LocalDateTime for the given Gregorian local date and time.
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/// * year is from 0 to 9999.
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/// * month is from 1 to 12.
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/// * day is from 1 to 31.
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/// * hour is from 0 to 23.
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/// * minute is from 0 to 59.
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/// * second is from 0 to 59.
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/// * millisecond is from 0 to 999.
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/// * microsecond is from 0 to 999.
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//@ deprecated
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LocalDateTime(int tzd, int year, int month, int day, int hour, int minute, int second, int millisecond, int microsecond);
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/// Creates a LocalDateTime for the given Gregorian date and time in the
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/// time zone denoted by the time zone differential in tzd.
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/// * tzd is in seconds.
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/// * year is from 0 to 9999.
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/// * month is from 1 to 12.
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/// * day is from 1 to 31.
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/// * hour is from 0 to 23.
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/// * minute is from 0 to 59.
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/// * second is from 0 to 59.
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/// * millisecond is from 0 to 999.
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/// * microsecond is from 0 to 999.
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LocalDateTime(const DateTime& dateTime);
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/// Creates a LocalDateTime from the UTC time given in dateTime,
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/// using the time zone differential of the current time zone.
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//@ deprecated
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LocalDateTime(int tzd, const DateTime& dateTime);
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/// Creates a LocalDateTime from the UTC time given in dateTime,
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/// using the given time zone differential. Adjusts dateTime
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/// for the given time zone differential.
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//@ deprecated
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LocalDateTime(int tzd, const DateTime& dateTime, bool adjust);
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/// Creates a LocalDateTime from the UTC time given in dateTime,
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/// using the given time zone differential. If adjust is true,
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/// adjusts dateTime for the given time zone differential.
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LocalDateTime(double julianDay);
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/// Creates a LocalDateTime for the given Julian day in the local time zone.
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//@ deprecated
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LocalDateTime(int tzd, double julianDay);
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/// Creates a LocalDateTime for the given Julian day in the time zone
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/// denoted by the time zone differential in tzd.
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LocalDateTime(const LocalDateTime& dateTime);
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/// Copy constructor. Creates the LocalDateTime from another one.
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~LocalDateTime();
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/// Destroys the LocalDateTime.
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LocalDateTime& operator = (const LocalDateTime& dateTime);
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/// Assigns another LocalDateTime.
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LocalDateTime& operator = (const Timestamp& timestamp);
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/// Assigns a timestamp
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LocalDateTime& operator = (double julianDay);
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/// Assigns a Julian day in the local time zone.
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LocalDateTime& assign(int year, int month, int day, int hour = 0, int minute = 0, int second = 0, int millisecond = 0, int microseconds = 0);
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/// Assigns a Gregorian local date and time.
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/// * year is from 0 to 9999.
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/// * month is from 1 to 12.
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/// * day is from 1 to 31.
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/// * hour is from 0 to 23.
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/// * minute is from 0 to 59.
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/// * second is from 0 to 59.
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/// * millisecond is from 0 to 999.
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/// * microsecond is from 0 to 999.
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//@ deprecated
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LocalDateTime& assign(int tzd, int year, int month, int day, int hour, int minute, int second, int millisecond, int microseconds);
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/// Assigns a Gregorian local date and time in the time zone denoted by
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/// the time zone differential in tzd.
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/// * tzd is in seconds.
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/// * year is from 0 to 9999.
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/// * month is from 1 to 12.
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/// * day is from 1 to 31.
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/// * hour is from 0 to 23.
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/// * minute is from 0 to 59.
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/// * second is from 0 to 59.
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/// * millisecond is from 0 to 999.
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/// * microsecond is from 0 to 999.
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//@ deprecated
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LocalDateTime& assign(int tzd, double julianDay);
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/// Assigns a Julian day in the time zone denoted by the
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/// time zone differential in tzd.
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void swap(LocalDateTime& dateTime);
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/// Swaps the LocalDateTime with another one.
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int year() const;
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/// Returns the year.
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int month() const;
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/// Returns the month (1 to 12).
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int week(int firstDayOfWeek = DateTime::MONDAY) const;
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/// Returns the week number within the year.
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/// FirstDayOfWeek should be either SUNDAY (0) or MONDAY (1).
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/// The returned week number will be from 0 to 53. Week number 1 is the week
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/// containing January 4. This is in accordance to ISO 8601.
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///
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/// The following example assumes that firstDayOfWeek is MONDAY. For 2005, which started
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/// on a Saturday, week 1 will be the week starting on Monday, January 3.
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/// January 1 and 2 will fall within week 0 (or the last week of the previous year).
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///
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/// For 2007, which starts on a Monday, week 1 will be the week starting on Monday, January 1.
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/// There will be no week 0 in 2007.
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int day() const;
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/// Returns the day within the month (1 to 31).
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int dayOfWeek() const;
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/// Returns the weekday (0 to 6, where
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/// 0 = Sunday, 1 = Monday, ..., 6 = Saturday).
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int dayOfYear() const;
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/// Returns the number of the day in the year.
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/// January 1 is 1, February 1 is 32, etc.
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int hour() const;
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/// Returns the hour (0 to 23).
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int hourAMPM() const;
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/// Returns the hour (0 to 12).
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bool isAM() const;
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/// Returns true if hour < 12;
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bool isPM() const;
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/// Returns true if hour >= 12.
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int minute() const;
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/// Returns the minute (0 to 59).
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int second() const;
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/// Returns the second (0 to 59).
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int millisecond() const;
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/// Returns the millisecond (0 to 999)
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int microsecond() const;
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/// Returns the microsecond (0 to 999)
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double julianDay() const;
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/// Returns the Julian day for the date.
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int tzd() const;
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/// Returns the time zone differential.
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DateTime utc() const;
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/// Returns the UTC equivalent for the local date and time.
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Timestamp timestamp() const;
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/// Returns the date and time expressed as a Timestamp.
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Timestamp::UtcTimeVal utcTime() const;
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/// Returns the UTC equivalent for the local date and time.
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bool operator == (const LocalDateTime& dateTime) const;
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bool operator != (const LocalDateTime& dateTime) const;
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bool operator < (const LocalDateTime& dateTime) const;
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bool operator <= (const LocalDateTime& dateTime) const;
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bool operator > (const LocalDateTime& dateTime) const;
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bool operator >= (const LocalDateTime& dateTime) const;
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LocalDateTime operator + (const Timespan& span) const;
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LocalDateTime operator - (const Timespan& span) const;
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Timespan operator - (const LocalDateTime& dateTime) const;
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LocalDateTime& operator += (const Timespan& span);
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LocalDateTime& operator -= (const Timespan& span);
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protected:
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LocalDateTime(Timestamp::UtcTimeVal utcTime, Timestamp::TimeDiff diff, int tzd);
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void determineTzd(bool adjust = false);
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/// Recalculate the tzd based on the _dateTime member based
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/// on the current timezone using the Standard C runtime functions.
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/// If adjust is true, then adjustForTzd() is called after the
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/// differential is calculated.
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void adjustForTzd();
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/// Adjust the _dateTime member based on the _tzd member.
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std::time_t dstOffset(int& dstOffset) const;
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/// Determine the DST offset for the current date/time.
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private:
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DateTime _dateTime;
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int _tzd;
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friend class DateTimeFormatter;
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friend class DateTimeParser;
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};
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//
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// inlines
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//
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inline int LocalDateTime::year() const
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{
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return _dateTime.year();
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}
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inline int LocalDateTime::month() const
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{
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return _dateTime.month();
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}
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inline int LocalDateTime::week(int firstDayOfWeek) const
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{
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return _dateTime.week(firstDayOfWeek);
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}
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inline int LocalDateTime::day() const
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{
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return _dateTime.day();
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}
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inline int LocalDateTime::dayOfWeek() const
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{
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return _dateTime.dayOfWeek();
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}
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inline int LocalDateTime::dayOfYear() const
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{
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return _dateTime.dayOfYear();
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}
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inline int LocalDateTime::hour() const
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{
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return _dateTime.hour();
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}
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inline int LocalDateTime::hourAMPM() const
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{
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return _dateTime.hourAMPM();
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}
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inline bool LocalDateTime::isAM() const
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{
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return _dateTime.isAM();
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}
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inline bool LocalDateTime::isPM() const
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{
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return _dateTime.isPM();
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}
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inline int LocalDateTime::minute() const
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{
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return _dateTime.minute();
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}
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inline int LocalDateTime::second() const
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{
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return _dateTime.second();
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}
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inline int LocalDateTime::millisecond() const
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{
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return _dateTime.millisecond();
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}
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inline int LocalDateTime::microsecond() const
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{
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return _dateTime.microsecond();
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}
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inline double LocalDateTime::julianDay() const
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{
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return _dateTime.julianDay();
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}
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inline int LocalDateTime::tzd() const
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{
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return _tzd;
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}
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inline Timestamp LocalDateTime::timestamp() const
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{
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return Timestamp::fromUtcTime(_dateTime.utcTime());
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}
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inline Timestamp::UtcTimeVal LocalDateTime::utcTime() const
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{
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return _dateTime.utcTime() - ((Timestamp::TimeDiff) _tzd)*10000000;
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}
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inline void LocalDateTime::adjustForTzd()
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{
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_dateTime += Timespan(((Timestamp::TimeDiff) _tzd)*Timespan::SECONDS);
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}
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inline void swap(LocalDateTime& d1, LocalDateTime& d2)
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{
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d1.swap(d2);
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}
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} // namespace Poco
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#endif // Foundation_LocalDateTime_INCLUDED
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