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Class calypso.util.NetworkDate
java.lang.Object | +----calypso.util.NetworkDate
Parses a date out of a string of bytes. Call it like this:
-
ByteBuf bytes = ... ;
Date date = NetworkDate.parseDate(bytes);
Note that it operates on bytes, not chars, since network dates are always ASCII.
Why would you want to use this instead of java.text.DateFormat.parse()? Because this algorithm has been tested in the field against real-world message headers for several years (the C code hadn't changed substantively since Netscape 2.0.) (There had been DST-related problems, but the tokenizer/parser was always sound.)
See Also: Date, Calendar, DateFormat
public class NetworkDate
extends java.lang.Object
{
// Fields 36
private static final int APR;
private static final int AST;
private static final int AUG;
private static final int BST;
private static final int CDT;
private static final int CST;
private static final int DEC;
private static final int EDT;
private static final int EET;
private static final int EST;
private static final int FEB;
private static final int FRI;
private static final int GMT;
private static final int JAN;
private static final int JST;
private static final int JUL;
private static final int JUN;
private static final int MAR;
private static final int MAY;
private static final int MDT;
private static final int MET;
private static final int MON;
private static final int MST;
private static final int NOV;
private static final int NST;
private static final int OCT;
private static final int PDT;
private static final int PST;
private static final int SAT;
private static final int SEP;
private static final int SUN;
private static final int THU;
private static final int TUE;
private static final int UNKNOWN;
private static final int WED;
private static final short[] monthOffset;
// Constructors 1
private NetworkDate();
// Methods 7
public static long UTC(int, int, int, int, int, int);
private static int localZoneOffset();
public static Date parseDate(ByteBuf);
public static Date parseDate(ByteBuf, boolean);
public static long parseLong(byte[], int, int, boolean);
public static long parseLong(ByteBuf);
public static long parseLong(ByteBuf, boolean);
}
Fields
• UNKNOWN
private static final int UNKNOWN
• SUN
private static final int SUN
• MON
private static final int MON
• TUE
private static final int TUE
• WED
private static final int WED
• THU
private static final int THU
• FRI
private static final int FRI
• SAT
private static final int SAT
• JAN
private static final int JAN
• FEB
private static final int FEB
• MAR
private static final int MAR
• APR
private static final int APR
• MAY
private static final int MAY
• JUN
private static final int JUN
• JUL
private static final int JUL
• AUG
private static final int AUG
• SEP
private static final int SEP
• OCT
private static final int OCT
• NOV
private static final int NOV
• DEC
private static final int DEC
• PST
private static final int PST
• PDT
private static final int PDT
• MST
private static final int MST
• MDT
private static final int MDT
• CST
private static final int CST
• CDT
private static final int CDT
• EST
private static final int EST
• EDT
private static final int EDT
• AST
private static final int AST
• NST
private static final int NST
• GMT
private static final int GMT
• BST
private static final int BST
• MET
private static final int MET
• EET
private static final int EET
• JST
private static final int JST
• monthOffset
private static final short[] monthOffset
Constructors
• NetworkDate
private NetworkDate()
Methods
• parseLong
public static long parseLong(ByteBuf buf, boolean default_to_gmt)
This parses a time/date string into a Time object. If it can't be parsed, -1 is returned.
Many formats are handled, including:
- 14 Apr 89 03:20:12
- 14 Apr 89 03:20 GMT
- Fri, 17 Mar 89 4:01:33
- Fri, 17 Mar 89 4:01 GMT
- Mon Jan 16 16:12 PDT 1989
- Mon Jan 16 16:12 +0130 1989
- 6 May 1992 16:41-JST (Wednesday)
- 22-AUG-1993 10:59:12.82
- 22-AUG-1993 10:59pm
- 22-AUG-1993 12:59am
- 22-AUG-1993 12:59 PM
- Friday, August 04, 1995 3:54 PM
- 06/21/95 04:24:34 PM
- 20/06/95 21:07
- 95-06-08 19:32:48 EDT
But note that 6/5/95 is ambiguous, since it's not obvious which is the day and which is the month. (6/13/95 is not ambiguous, however.)
Parameter Description buf The bytes to parse. This assumes the input to be a sequence of 8-bit ASCII characters. High-bit characters are handled; 16-bit Unicode characters are not. default_to_gmt If the input string doesn't contain a description of the timezone, then this argument determines whether the string is interpreted relative to the local time zone (false) or to GMT (true). The correct value to pass in for this argument depends on what standard specified the time string which you are parsing; for RFC822 dates, this argument should be true.
- Returns:
- Microseconds since Jan 1, 1900, GMT. You can pass this to new Date(long). Returns -1 if the string is unparsable (no other negative value will ever be returned; dates before the Epoch are not handled.)
• parseLong
public static long parseLong(byte[] string,
int start,
int end,
boolean default_to_gmt)
The same, but takes a byte array and a region within it, instead of a ByteBuf.
• parseLong
public static long parseLong(ByteBuf string)
The same, but assumes GMT is the default timezone.
• parseDate
public static Date parseDate(ByteBuf string, boolean default_to_gmt)
Like parseLong(), but returns a new Date object instead.
• parseDate
public static Date parseDate(ByteBuf string)
The same, but assumes GMT is the default timezone.
• UTC
public static long UTC(int year,
int month,
int date,
int hour,
int min,
int sec)
Composes the given date into a number suitable for passing to new Date(n). This is the number of milliseconds past the Epoch.
• localZoneOffset
private static int localZoneOffset()
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