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: Class NetworkDate
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calypso.util</FONT>
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Class NetworkDate</H2>
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<PRE>
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java.lang.Object
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+--<B>calypso.util.NetworkDate</B>
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</PRE>
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<DL>
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<DT>public class <B>NetworkDate</B><DT>extends java.lang.Object</DL>
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<P>
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Parses a date out of a string of bytes. Call it like this:
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<P><UL>
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<TT>ByteBuf bytes = </TT>...<TT> ;</TT><BR>
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<TT>Date date = NetworkDate.parseDate(bytes);</TT>
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</UL>
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<P> Note that it operates on bytes, not chars, since network
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dates are always ASCII.
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<P> Why would you want to use this instead of
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<TT>java.text.DateFormat.parse()</TT>? Because this algorithm has been
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tested in the field against real-world message headers for several
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years (the C code hadn't changed substantively since Netscape 2.0.)
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(There had been DST-related problems, but the tokenizer/parser was
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always sound.)
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<P>
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<DL>
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<DT><B>See Also: </B><DD><CODE>Date</CODE>,
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<CODE>Calendar</CODE>,
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<CODE>DateFormat</CODE></DL>
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<HR>
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<!-- ======== INNER CLASS SUMMARY ======== -->
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<B>Method Summary</B></FONT></TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static java.util.Date</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../calypso/util/NetworkDate.html#parseDate(calypso.util.ByteBuf)">parseDate</A></B>(<A HREF="../../calypso/util/ByteBuf.html">ByteBuf</A> string)</CODE>
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<BR>
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The same, but assumes GMT is the default timezone.</TD>
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</TR>
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<TR BGCOLOR="white" ID="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static java.util.Date</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../calypso/util/NetworkDate.html#parseDate(calypso.util.ByteBuf, boolean)">parseDate</A></B>(<A HREF="../../calypso/util/ByteBuf.html">ByteBuf</A> string,
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boolean default_to_gmt)</CODE>
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<BR>
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Like parseLong(), but returns a new Date object instead.</TD>
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</TR>
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<TR BGCOLOR="white" ID="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static long</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../calypso/util/NetworkDate.html#parseLong(byte[], int, int, boolean)">parseLong</A></B>(byte[] string,
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int start,
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int end,
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boolean default_to_gmt)</CODE>
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<BR>
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The same, but takes a byte array and a region within it, instead
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of a ByteBuf.</TD>
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</TR>
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<TR BGCOLOR="white" ID="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static long</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../calypso/util/NetworkDate.html#parseLong(calypso.util.ByteBuf)">parseLong</A></B>(<A HREF="../../calypso/util/ByteBuf.html">ByteBuf</A> string)</CODE>
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<BR>
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The same, but assumes GMT is the default timezone.</TD>
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</TR>
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<TR BGCOLOR="white" ID="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static long</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../calypso/util/NetworkDate.html#parseLong(calypso.util.ByteBuf, boolean)">parseLong</A></B>(<A HREF="../../calypso/util/ByteBuf.html">ByteBuf</A> buf,
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boolean default_to_gmt)</CODE>
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<BR>
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This parses a time/date string into a Time object.</TD>
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</TR>
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<TR BGCOLOR="white" ID="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static long</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../calypso/util/NetworkDate.html#UTC(int, int, int, int, int, int)">UTC</A></B>(int year,
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int month,
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int date,
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int hour,
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int min,
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int sec)</CODE>
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<BR>
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Composes the given date into a number suitable for passing to
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<TT>new Date(n)</TT>.</TD>
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</TR>
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</TABLE>
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<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
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<TR BGCOLOR="#EEEEFF" ID="TableSubHeadingColor">
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<TD><B>Methods inherited from class java.lang.Object</B></TD>
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</TR>
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<TR BGCOLOR="white" ID="TableRowColor">
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<TD><CODE>clone,
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equals,
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finalize,
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getClass,
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hashCode,
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notify,
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notifyAll,
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toString,
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wait,
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wait,
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wait</CODE></TD>
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<!-- ============ FIELD DETAIL =========== -->
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<A NAME="parseLong(calypso.util.ByteBuf, boolean)"><!-- --></A><H3>
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parseLong</H3>
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<PRE>
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public static long <B>parseLong</B>(<A HREF="../../calypso/util/ByteBuf.html">ByteBuf</A> buf,
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boolean default_to_gmt)</PRE>
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<DL>
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<DD>This parses a time/date string into a Time object.
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If it can't be parsed, -1 is returned.
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<P>Many formats are handled, including:
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<P><UL>
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<LI> <TT> 14 Apr 89 03:20:12 </TT>
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<LI> <TT> 14 Apr 89 03:20 GMT </TT>
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<LI> <TT> Fri, 17 Mar 89 4:01:33 </TT>
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<LI> <TT> Fri, 17 Mar 89 4:01 GMT </TT>
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<LI> <TT> Mon Jan 16 16:12 PDT 1989 </TT>
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<LI> <TT> Mon Jan 16 16:12 +0130 1989 </TT>
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<LI> <TT> 6 May 1992 16:41-JST (Wednesday) </TT>
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<LI> <TT> 22-AUG-1993 10:59:12.82 </TT>
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<LI> <TT> 22-AUG-1993 10:59pm </TT>
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<LI> <TT> 22-AUG-1993 12:59am </TT>
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<LI> <TT> 22-AUG-1993 12:59 PM </TT>
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<LI> <TT> Friday, August 04, 1995 3:54 PM </TT>
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<LI> <TT> 06/21/95 04:24:34 PM </TT>
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<LI> <TT> 20/06/95 21:07 </TT>
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<LI> <TT> 95-06-08 19:32:48 EDT </TT>
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</UL>
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<P> But note that <TT>6/5/95</TT> is ambiguous, since it's not obvious
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which is the day and which is the month. (<TT>6/13/95</TT> is not
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ambiguous, however.)<DD><DL>
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<DT><B>Parameters:</B><DD><CODE>buf</CODE> - The bytes to parse. This assumes the input to be
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a sequence of 8-bit ASCII characters. High-bit
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characters are handled; 16-bit Unicode characters
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are not.<DD><CODE>default_to_gmt</CODE> - If the input string doesn't contain a description
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of the timezone, then this argument determines whether the string is
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interpreted relative to the local time zone (false) or to GMT (true).
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The correct value to pass in for this argument depends on what standard
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specified the time string which you are parsing; for RFC822 dates, this
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argument should be true.<DT><B>Returns:</B><DD>Microseconds since Jan 1, 1900, GMT.
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You can pass this to <TT>new Date(long)</TT>.
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Returns -1 if the string is unparsable
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(no other negative value will ever be returned;
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dates before the Epoch are not handled.)</DL>
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</DD>
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</DL>
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<HR>
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<A NAME="parseLong(byte[], int, int, boolean)"><!-- --></A><H3>
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parseLong</H3>
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<PRE>
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public static long <B>parseLong</B>(byte[] string,
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int start,
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int end,
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boolean default_to_gmt)</PRE>
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<DL>
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<DD>The same, but takes a byte array and a region within it, instead
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of a ByteBuf.</DL>
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<HR>
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<A NAME="parseLong(calypso.util.ByteBuf)"><!-- --></A><H3>
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parseLong</H3>
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<PRE>
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public static long <B>parseLong</B>(<A HREF="../../calypso/util/ByteBuf.html">ByteBuf</A> string)</PRE>
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<DL>
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<DD>The same, but assumes GMT is the default timezone.</DL>
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<HR>
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<A NAME="parseDate(calypso.util.ByteBuf, boolean)"><!-- --></A><H3>
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parseDate</H3>
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<PRE>
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public static java.util.Date <B>parseDate</B>(<A HREF="../../calypso/util/ByteBuf.html">ByteBuf</A> string,
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boolean default_to_gmt)</PRE>
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<DL>
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<DD>Like parseLong(), but returns a new Date object instead.</DL>
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<HR>
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<A NAME="parseDate(calypso.util.ByteBuf)"><!-- --></A><H3>
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parseDate</H3>
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<PRE>
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public static java.util.Date <B>parseDate</B>(<A HREF="../../calypso/util/ByteBuf.html">ByteBuf</A> string)</PRE>
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<DL>
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<DD>The same, but assumes GMT is the default timezone.</DL>
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<HR>
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<A NAME="UTC(int, int, int, int, int, int)"><!-- --></A><H3>
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UTC</H3>
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<PRE>
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public static long <B>UTC</B>(int year,
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int month,
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int date,
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int hour,
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int min,
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int sec)</PRE>
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<DL>
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<DD>Composes the given date into a number suitable for passing to
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<TT>new Date(n)</TT>. This is the number of milliseconds
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past the Epoch.</DL>
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