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<HTML>
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<HEAD>
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<TITLE> DwDateTime Man Page </TITLE>
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</HEAD>
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<BODY BGCOLOR="#FFFFFF">
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<H2>
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<FONT COLOR="navy"> NAME </FONT>
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</H2>
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<P>
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DwDateTime -- Class representing an RFC-822 date-time
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<H2>
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<FONT COLOR="navy"> SYNOPSIS </FONT>
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</H2>
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<PRE>class DW_EXPORT DwDateTime : public <A HREF="fieldbdy.html">DwFieldBody</A> {
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public:
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<A HREF="datetime.html#DwDateTime">DwDateTime</A>();
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<A HREF="datetime.html#DwDateTime">DwDateTime</A>(const DwDateTime& aDateTime);
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<A HREF="datetime.html#DwDateTime">DwDateTime</A>(const DwString& aStr, DwMessageComponent* aParent=0);
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virtual ~DwDateTime();
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const DwDateTime& <A HREF="datetime.html#op_eq">operator =</A> (const DwDateTime& aDateTime);
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virtual void <A HREF="datetime.html#Parse">Parse</A>();
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virtual void <A HREF="datetime.html#Assemble">Assemble</A>();
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virtual DwMessageComponent* <A HREF="datetime.html#Clone">Clone</A>() const;
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DwUint32 <A HREF="datetime.html#AsUnixTime">AsUnixTime</A>() const;
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void <A HREF="datetime.html#FromUnixTime">FromUnixTime</A>(DwUint32 aTime);
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time_t <A HREF="datetime.html#AsCalendarTime">AsCalendarTime</A>() const;
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void <A HREF="datetime.html#FromCalendarTime">FromCalendarTime</A>(time_t aTime);
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DwInt32 <A HREF="datetime.html#DateAsJulianDayNum">DateAsJulianDayNum</A>() const;
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void <A HREF="datetime.html#DateFromJulianDayNum">DateFromJulianDayNum</A>(DwInt32 aJdn);
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DwInt32 <A HREF="datetime.html#TimeAsSecsPastMidnight">TimeAsSecsPastMidnight</A>() const;
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void <A HREF="datetime.html#TimeFromSecsPastMidnight">TimeFromSecsPastMidnight</A>(DwInt32 aSecs);
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int <A HREF="datetime.html#Year">Year</A>() const;
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void <A HREF="datetime.html#SetYear">SetYear</A>(int aYear);
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int <A HREF="datetime.html#Month">Month</A>() const;
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void <A HREF="datetime.html#SetMonth">SetMonth</A>(int aMonth);
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int <A HREF="datetime.html#Day">Day</A>() const;
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void <A HREF="datetime.html#SetDay">SetDay</A>(int aDay);
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int <A HREF="datetime.html#Hour">Hour</A>() const;
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void <A HREF="datetime.html#SetHour">SetHour</A>(int aHour);
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int <A HREF="datetime.html#Minute">Minute</A>() const;
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void <A HREF="datetime.html#SetMinute">SetMinute</A>(int aMinute);
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int <A HREF="datetime.html#Second">Second</A>() const;
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void <A HREF="datetime.html#SetSecond">SetSecond</A>(int aSecond);
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int <A HREF="datetime.html#Zone">Zone</A>() const;
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void <A HREF="datetime.html#SetZone">SetZone</A>(int aZone);
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static void <A HREF="datetime.html#SetDefaultZone">SetDefaultZone</A>(int aZone);
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static DwDateTime* <A HREF="datetime.html#NewDateTime">NewDateTime</A>(const DwString&, DwMessageComponent*);
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static DwDateTime* (*<A HREF="datetime.html#sNewDateTime">sNewDateTime</A>)(const DwString&, DwMessageComponent*);
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protected:
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void <A HREF="datetime.html#_FromUnixTime">_FromUnixTime</A>(DwUint32 aTime);
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void <A HREF="datetime.html#_FromCalendarTime">_FromCalendarTime</A>(time_t aTime);
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int mYear;
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int mMonth;
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int mDay;
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int mHour;
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int mMinute;
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int mSecond;
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int mZone;
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static int sDefaultZone;
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static int sIsDefaultZoneSet;
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public:
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virtual void <A HREF="datetime.html#PrintDebugInfo">PrintDebugInfo</A>(ostream& aStrm, int aDepth=0) const;
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virtual void <A HREF="datetime.html#CheckInvariants">CheckInvariants</A>() const;
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protected:
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void _PrintDebugInfo(ostream& aStrm) const;
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};
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</PRE>
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<H2>
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<FONT COLOR="navy"> DESCRIPTION </FONT>
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</H2>
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<P>
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<B><TT>DwDatetime</TT></B> represents a <I>date-time</I> as described in
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RFC-822 and RFC-1123. The parse method for <B><TT>DwDateTime</TT></B> parses
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the string representation to extract the year, month, day, hour, minute,
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second, and time zone. <B><TT>DwDateTime</TT></B> provides member functions
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to set or get the individual components of the date-time.
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<H2>
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<FONT COLOR="navy"> Public Member Functions </FONT>
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</H2>
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<P>
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<FONT COLOR="teal"><B> <A NAME="DwDateTime">DwDateTime</A>() <BR>
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DwDateTime(const DwDateTime& aDateTime) <BR>
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DwDateTime(const DwString& aStr, DwMessageComponent* aParent=0)
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</B></FONT>
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<P>
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The first constructor is the default constructor, which assigns the current
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date and time as reported by the operating system.
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<P>
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The second constructor is the copy constructor. The parent of the new
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<B><TT>DwDateTime</TT></B> object is set to <B><TT>NULL</TT></B>.
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<P>
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The third constructor sets <B><TT>aStr</TT></B> as the
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<B><TT>DwDateTime</TT></B> object's string representation and sets
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<B><TT>aParent</TT></B> as its parent. The virtual member function
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<B><TT>Parse()</TT></B> should be called after this constructor to extract
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the date and time information from the string representation. Unless it is
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<B><TT>NULL</TT></B>, <B><TT>aParent</TT></B> should point to an object of
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a class derived from <B><TT>DwField</TT></B>.
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<P>
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<FONT COLOR="teal"><B> const DwDateTime& <A NAME="op_eq">operator =</A>
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(const DwDateTime& aDateTime) </B></FONT>
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<P>
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This is the assignment operator, which sets this
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<B><TT>DwDateTime</TT></B> object to the same value as
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<B><TT>aDateTime</TT></B>.
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<P>
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<FONT COLOR="teal"><B> virtual void <A NAME="Parse">Parse</A>() </B></FONT>
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<P>
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This virtual function, inherited from <B><TT>DwMessageComponent</TT></B>,
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executes the parse method for <B><TT>DwDateTime</TT></B> objects. The parse
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method creates or updates the broken-down representation from the string
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representation. For <B><TT>DwDateTime</TT></B> objects, the parse method
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parses the string representation to extract the year, month, day, hour, minute,
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second, and time zone.
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<P>
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This function clears the is-modified flag.
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<P>
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<FONT COLOR="teal"><B> virtual void <A NAME="Assemble">Assemble</A>()
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</B></FONT>
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<P>
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This virtual function, inherited from <B><TT>DwMessageComponent</TT></B>,
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executes the assemble method for <B><TT>DwDateTime</TT></B> objects. It should
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be called whenever one of the object's attributes is changed in order to
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assemble the string representation from its broken-down representation. It
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will be called automatically for this object by the parent object's
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<B><TT>Assemble()</TT></B> member function if the is-modified flag is set.
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<P>
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This function clears the is-modified flag.
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<P>
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<FONT COLOR="teal"><B> virtual DwMessageComponent*
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<A NAME="Clone">Clone</A>() const </B></FONT>
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<P>
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This virtual function, inherited from <B><TT>DwMessageComponent</TT></B>,
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creates a new <B><TT>DwDateTime</TT></B> on the free store that has the same
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value as this <B><TT>DwDateTime</TT></B> object. The basic idea is that of
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a virtual copy constructor.
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<P>
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<FONT COLOR="teal"><B> DwUint32 <A NAME="AsUnixTime">AsUnixTime</A>() const
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</B></FONT>
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<P>
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Returns the date and time as a UNIX (POSIX) time, defined as the number of
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seconds elapsed since 1 Jan 1970 00:00:00 UTC.
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<P>
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<FONT COLOR="teal"><B> void <A NAME="FromUnixTime">FromUnixTime</A>(DwUint32
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aTime) </B></FONT>
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<P>
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Sets the date and time from <B><TT>aTime</TT></B>, interpreted as the number
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of of seconds elapsed since 1 Jan 1970 00:00:00 UTC.
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<P>
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<FONT COLOR="teal"><B> time_t <A NAME="AsCalendarTime">AsCalendarTime</A>()
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const </B></FONT>
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<P>
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Returns the date and time as a value of type <B><TT>time_t</TT></B> that
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conforms to the native format returned by the <B><TT>time()</TT></B> ANSI
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C function. On most UNIX systems, this function returns the same value as
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<B><TT>AsUnixTime()</TT></B>. (For efficiency, use
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<B><TT>AsUnixTime()</TT></B> instead of <B><TT>AsCalendarTime()</TT></B>
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if possible).
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<P>
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<FONT COLOR="teal"><B> void
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<A NAME="FromCalendarTime">FromCalendarTime</A>(time_t aTime) </B></FONT>
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<P>
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Sets the date and time from <B><TT>aTime</TT></B>, which is assumed to be
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in a format compatible with the native <B><TT>time()</TT></B> ANSI C function.
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For most UNIX systems, this function is the same as the function
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<B><TT>FromUnixTime()</TT></B>. (For efficiency, use
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<B><TT>FromUnixTime()</TT></B> instead of
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<B><TT>FromCalendarTime()</TT></B> if possible).
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<P>
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<FONT COLOR="teal"><B> DwInt32
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<A NAME="DateAsJulianDayNum">DateAsJulianDayNum</A>() const </B></FONT>
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<P>
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Returns the Julian Day Number, defined as the number of days elapsed since
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1 Jan 4713 BC. The JDN is calculated directly from the values of the year,
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month, and day; time zone information is ignored.
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<P>
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<FONT COLOR="teal"><B> void
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<A NAME="DateFromJulianDayNum">DateFromJulianDayNum</A>(DwInt32 aJdn)
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</B></FONT>
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<P>
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Sets the year, month, and day from <B><TT>aJdn</TT></B>, interpreted as a
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Julian Day Number. By definition, the JDN is the number of days elapsed since
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1 Jan 4713 BC. This member function ignores time zone information.
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<P>
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<FONT COLOR="teal"><B> DwInt32
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<A NAME="TimeAsSecsPastMidnight">TimeAsSecsPastMidnight</A>() const
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</B></FONT>
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<P>
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Returns the number of seconds past midnight. The value is calculated directly
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from the values of the hour, minute, and second; time zone information is
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ignored.
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<P>
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<FONT COLOR="teal"><B> void
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<A NAME="TimeFromSecsPastMidnight">TimeFromSecsPastMidnight</A>(DwInt32 aSecs)
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</B></FONT>
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<P>
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Sets the hour, minute, and second from <B><TT>aSecs</TT></B>, interpreted
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as the number of seconds elapsed since midnight. This member function ignores
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time zone information. The argument <B><TT>aSecs</TT></B> should be in the
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range 0 to 86399, inclusive.
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<P>
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<FONT COLOR="teal"><B> int <A NAME="Year">Year</A>() const </B></FONT>
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<P>
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Returns the four digit year, e.g. 1997.
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<P>
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<FONT COLOR="teal"><B> void <A NAME="SetYear">SetYear</A>(int aYear)
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</B></FONT>
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<P>
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Sets the year from <B><TT>aYear</TT></B>, which should be a four digit year.
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<P>
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<FONT COLOR="teal"><B> int <A NAME="Month">Month</A>() const </B></FONT>
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<P>
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Returns the month. Values range from 1 to 12.
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<P>
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<FONT COLOR="teal"><B> void <A NAME="SetMonth">SetMonth</A>(int aMonth)
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</B></FONT>
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<P>
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Sets the month from <B><TT>aMonth</TT></B>, which should be in the range
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1 to 12.
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<P>
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<FONT COLOR="teal"><B> int <A NAME="Day">Day</A>() const </B></FONT>
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<P>
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Returns the day of the month. Values range from 1 to 31.
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<P>
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<FONT COLOR="teal"><B> void <A NAME="SetDay">SetDay</A>(int aDay) </B></FONT>
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<P>
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Sets the day of the month from <B><TT>aDay</TT></B>.
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<P>
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<FONT COLOR="teal"><B> int <A NAME="Hour">Hour</A>() const </B></FONT>
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<P>
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Returns the hour according to the 24 hour clock. Values range from 0 to 23.
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<P>
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<FONT COLOR="teal"><B> void <A NAME="SetHour">SetHour</A>(int aHour)
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</B></FONT>
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<P>
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Sets the hour from <B><TT>aHour</TT></B> based on the 24-hour clock.
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<B><TT>aHour</TT></B> should be in the range 0 to 23.
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<P>
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<FONT COLOR="teal"><B> int <A NAME="Minute">Minute</A>() const </B></FONT>
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<P>
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Returns the minute. Values range from 0 to 59.
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<P>
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<FONT COLOR="teal"><B> void <A NAME="SetMinute">SetMinute</A>(int aMinute)
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</B></FONT>
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<P>
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Sets the minute from <B><TT>aMinute</TT></B>, which should be in the range
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0 to 59.
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<P>
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<FONT COLOR="teal"><B> int <A NAME="Second">Second</A>() const </B></FONT>
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<P>
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Returns the second. Values range from 0 to 59.
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<P>
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<FONT COLOR="teal"><B> void <A NAME="SetSecond">SetSecond</A>(int aSecond)
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</B></FONT>
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<P>
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Sets the second from <B><TT>aSecond</TT></B>, which should be in the range
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0 to 59.
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<P>
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<FONT COLOR="teal"><B> int <A NAME="Zone">Zone</A>() const </B></FONT>
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<P>
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Returns the time zone as the diffence in minutes between local time and
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Coordinated Universal Time (UTC or GMT).
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<P>
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<FONT COLOR="teal"><B> void <A NAME="SetZone">SetZone</A>(int aZone)
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</B></FONT>
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<P>
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Sets the time zone from <B><TT>aZone</TT></B>, interpreted as the time difference
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in minutes between local time and Coordinated Universal Time (UTC, or GMT).
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<P>
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<FONT COLOR="teal"><B> static void
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<A NAME="SetDefaultZone">SetDefaultZone</A>(int aZone) </B></FONT>
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<P>
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Sets the default time zone. <B><TT>aZone</TT></B> should be the time difference
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in minutes between local time and Coordinated Universal Time (UTC, or GMT).
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The value is used to set the time zone for any objects created using the
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default constructor.
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<P>
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<FONT COLOR="teal"><B> static DwDateTime*
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<A NAME="NewDateTime">NewDateTime</A>(const DwString&, DwMessageComponent*)
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</B></FONT>
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<P>
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Creates a new <B><TT>DwDateTime</TT></B> object on the free store. If the
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static data member <B><TT>sNewDateTime</TT></B> is <B><TT>NULL</TT></B>,
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this member function will create a new <B><TT>DwDateTime</TT></B> and return
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it. Otherwise, <B><TT>NewDateTime()</TT></B> will call the user-supplied
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function pointed to by <B><TT>sNewDateTime</TT></B>, which is assumed to
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return an object from a class derived from <B><TT>DwDateTime</TT></B>, and
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return that object.
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<P>
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<FONT COLOR="teal"><B> virtual void
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<A NAME="PrintDebugInfo">PrintDebugInfo</A>(ostream& aStrm, int aDepth=0)
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const </B></FONT>
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<P>
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This virtual function, inherited from <B><TT>DwMessageComponent</TT></B>,
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prints debugging information about this object to <B><TT>aStrm</TT></B>.
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<P>
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This member function is available only in the debug version of the library.
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<P>
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<FONT COLOR="teal"><B> virtual void
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<A NAME="CheckInvariants">CheckInvariants</A>() const </B></FONT>
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<P>
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Aborts if one of the invariants of the object fails. Use this member function
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to track down bugs.
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<P>
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This member function is available only in the debug version of the library.
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<H2>
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<FONT COLOR="navy"> Public Data Members </FONT>
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</H2>
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<P>
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<FONT COLOR="teal"><B> static DwDateTime*
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(*<A NAME="sNewDateTime">sNewDateTime</A>)(const DwString&,
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DwMessageComponent*) </B></FONT>
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<P>
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If <B><TT>sNewDateTime</TT></B> is not <B><TT>NULL</TT></B>, it is assumed
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to point to a user-supplied function that returns an object from a class
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derived from <B><TT>DwDateTime</TT></B>.
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<H2>
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<FONT COLOR="navy"> Protected Member Functions </FONT>
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</H2>
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<P>
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<B><FONT COLOR="teal"> void
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<A NAME="_FromUnixTime">_FromUnixTime</A>(DwUint32 aTime) </FONT></B>
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<P>
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Like <B><TT>FromUnixTime()</TT></B>, but doesn't set the is-modified flag.
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<P>
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<B><FONT COLOR="teal"> void
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<A NAME="_FromCalendarTime">_FromCalendarTime</A>(time_t aTime) </FONT></B>
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<P>
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Like <B><TT>FromCalendarTime()</TT></B>, but doesn't set the is-modified
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flag.
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<P>
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</BODY></HTML>
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