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418 lines
10 KiB
C++
418 lines
10 KiB
C++
//
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// DateTime.h
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//
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// $Id: //poco/1.4/Foundation/include/Poco/DateTime.h#1 $
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//
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// Library: Foundation
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// Package: DateTime
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// Module: DateTime
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//
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// Definition of the DateTime 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_DateTime_INCLUDED
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#define Foundation_DateTime_INCLUDED
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#include "Poco/Foundation.h"
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#include "Poco/Timestamp.h"
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#include "Poco/Timespan.h"
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namespace Poco {
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class Foundation_API DateTime
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/// This class represents an instant in time, expressed
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/// in years, months, days, hours, minutes, seconds
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/// and milliseconds based on the Gregorian calendar.
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/// The class is mainly useful for conversions between
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/// UTC, Julian day and Gregorian calendar dates.
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///
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/// The date and time stored in a DateTime is always in UTC
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/// (Coordinated Universal Time) and thus independent of the
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/// timezone in effect on the system.
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///
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/// Conversion calculations are based on algorithms
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/// collected and described by Peter Baum at
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/// http://vsg.cape.com/~pbaum/date/date0.htm
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///
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/// Internally, this class stores a date/time in two
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/// forms (UTC and broken down) for performance reasons. Only use
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/// this class for conversions between date/time representations.
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/// Use the Timestamp class for everything else.
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///
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/// Notes:
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/// * Zero is a valid year (in accordance with ISO 8601 and astronomical year numbering)
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/// * Year zero (0) is a leap year
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/// * Negative years (years preceding 1 BC) are not supported
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///
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/// For more information, please see:
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/// * http://en.wikipedia.org/wiki/Gregorian_Calendar
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/// * http://en.wikipedia.org/wiki/Julian_day
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/// * http://en.wikipedia.org/wiki/UTC
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/// * http://en.wikipedia.org/wiki/ISO_8601
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{
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public:
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enum Months
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/// Symbolic names for month numbers (1 to 12).
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{
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JANUARY = 1,
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FEBRUARY,
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MARCH,
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APRIL,
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MAY,
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JUNE,
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JULY,
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AUGUST,
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SEPTEMBER,
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OCTOBER,
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NOVEMBER,
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DECEMBER
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};
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enum DaysOfWeek
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/// Symbolic names for week day numbers (0 to 6).
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{
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SUNDAY = 0,
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MONDAY,
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TUESDAY,
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WEDNESDAY,
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THURSDAY,
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FRIDAY,
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SATURDAY
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};
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DateTime();
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/// Creates a DateTime for the current date and time.
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DateTime(const Timestamp& timestamp);
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/// Creates a DateTime for the date and time given in
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/// a Timestamp.
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DateTime(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 DateTime for the given Gregorian 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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DateTime(double julianDay);
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/// Creates a DateTime for the given Julian day.
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DateTime(Timestamp::UtcTimeVal utcTime, Timestamp::TimeDiff diff);
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/// Creates a DateTime from an UtcTimeVal and a TimeDiff.
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///
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/// Mainly used internally by DateTime and friends.
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DateTime(const DateTime& dateTime);
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/// Copy constructor. Creates the DateTime from another one.
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~DateTime();
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/// Destroys the DateTime.
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DateTime& operator = (const DateTime& dateTime);
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/// Assigns another DateTime.
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DateTime& operator = (const Timestamp& timestamp);
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/// Assigns a Timestamp.
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DateTime& operator = (double julianDay);
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/// Assigns a Julian day.
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DateTime& 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 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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void swap(DateTime& dateTime);
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/// Swaps the DateTime 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 = 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 startung 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 witin 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 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 date and time expressed in UTC-based
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/// time. UTC base time is midnight, October 15, 1582.
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/// Resolution is 100 nanoseconds.
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bool operator == (const DateTime& dateTime) const;
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bool operator != (const DateTime& dateTime) const;
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bool operator < (const DateTime& dateTime) const;
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bool operator <= (const DateTime& dateTime) const;
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bool operator > (const DateTime& dateTime) const;
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bool operator >= (const DateTime& dateTime) const;
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DateTime operator + (const Timespan& span) const;
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DateTime operator - (const Timespan& span) const;
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Timespan operator - (const DateTime& dateTime) const;
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DateTime& operator += (const Timespan& span);
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DateTime& operator -= (const Timespan& span);
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void makeUTC(int tzd);
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/// Converts a local time into UTC, by applying the given time zone differential.
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void makeLocal(int tzd);
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/// Converts a UTC time into a local time, by applying the given time zone differential.
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static bool isLeapYear(int year);
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/// Returns true if the given year is a leap year;
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/// false otherwise.
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static int daysOfMonth(int year, int month);
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/// Returns the number of days in the given month
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/// and year. Month is from 1 to 12.
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static bool isValid(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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/// Checks if the given date and time is valid
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/// (all arguments are within a proper range).
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///
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/// Returns true if all arguments are valid, false otherwise.
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protected:
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static double toJulianDay(Timestamp::UtcTimeVal utcTime);
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/// Computes the Julian day for an UTC time.
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static double toJulianDay(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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/// Computes the Julian day for a gregorian calendar date and time.
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/// See <http://vsg.cape.com/~pbaum/date/jdimp.htm>, section 2.3.1 for the algorithm.
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static Timestamp::UtcTimeVal toUtcTime(double julianDay);
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/// Computes the UTC time for a Julian day.
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void computeGregorian(double julianDay);
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/// Computes the Gregorian date for the given Julian day.
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/// See <http://vsg.cape.com/~pbaum/date/injdimp.htm>, section 3.3.1 for the algorithm.
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void computeDaytime();
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/// Extracts the daytime (hours, minutes, seconds, etc.) from the stored utcTime.
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private:
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void checkLimit(short& lower, short& higher, short limit);
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void normalize();
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///utility functions used to correct the overflow in computeGregorian
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Timestamp::UtcTimeVal _utcTime;
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short _year;
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short _month;
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short _day;
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short _hour;
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short _minute;
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short _second;
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short _millisecond;
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short _microsecond;
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};
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//
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// inlines
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//
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inline Timestamp DateTime::timestamp() const
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{
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return Timestamp::fromUtcTime(_utcTime);
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}
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inline Timestamp::UtcTimeVal DateTime::utcTime() const
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{
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return _utcTime;
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}
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inline int DateTime::year() const
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{
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return _year;
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}
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inline int DateTime::month() const
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{
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return _month;
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}
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inline int DateTime::day() const
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{
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return _day;
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}
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inline int DateTime::hour() const
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{
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return _hour;
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}
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inline int DateTime::hourAMPM() const
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{
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if (_hour < 1)
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return 12;
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else if (_hour > 12)
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return _hour - 12;
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else
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return _hour;
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}
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inline bool DateTime::isAM() const
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{
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return _hour < 12;
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}
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inline bool DateTime::isPM() const
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{
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return _hour >= 12;
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}
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inline int DateTime::minute() const
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{
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return _minute;
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}
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inline int DateTime::second() const
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{
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return _second;
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}
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inline int DateTime::millisecond() const
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{
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return _millisecond;
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}
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inline int DateTime::microsecond() const
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{
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return _microsecond;
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}
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inline bool DateTime::operator == (const DateTime& dateTime) const
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{
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return _utcTime == dateTime._utcTime;
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}
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inline bool DateTime::operator != (const DateTime& dateTime) const
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{
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return _utcTime != dateTime._utcTime;
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}
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inline bool DateTime::operator < (const DateTime& dateTime) const
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{
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return _utcTime < dateTime._utcTime;
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}
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inline bool DateTime::operator <= (const DateTime& dateTime) const
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{
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return _utcTime <= dateTime._utcTime;
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}
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inline bool DateTime::operator > (const DateTime& dateTime) const
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{
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return _utcTime > dateTime._utcTime;
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}
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inline bool DateTime::operator >= (const DateTime& dateTime) const
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{
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return _utcTime >= dateTime._utcTime;
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}
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inline bool DateTime::isLeapYear(int year)
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{
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return (year % 4) == 0 && ((year % 100) != 0 || (year % 400) == 0);
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}
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inline void swap(DateTime& d1, DateTime& 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_DateTime_INCLUDED
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