PdfDate is the PDF date object.
*
* PDF defines a standard date format. The PDF date format closely follows the format
* defined by the international standard ASN.1 (Abstract Syntax Notation One, defined
* in CCITT X.208 or ISO/IEC 8824). A date is a PdfString of the form:
*
* (D:YYYYMMDDHHmmSSOHH'mm') *
* This object is described in the 'Portable Document Format Reference Manual version 1.3'
* section 7.2 (page 183-184)
*
* @see PdfString
* @see java.util.GregorianCalendar
*/
public class PdfDate : PdfString {
// constructors
/**
* Constructs a PdfDate-object.
*
* @param d the date that has to be turned into a PdfDate-object
*/
public PdfDate(DateTime d) : base() {
//d = d.ToUniversalTime();
value = d.ToString("\\D\\:yyyyMMddHHmmss", DateTimeFormatInfo.InvariantInfo);
string timezone = d.ToString("zzz", DateTimeFormatInfo.InvariantInfo);
timezone = timezone.Replace(":", "'");
value += timezone + "'";
}
/**
* Constructs a PdfDate-object, representing the current day and time.
*/
public PdfDate() : this(DateTime.Now) {}
/**
* Adds a number of leading zeros to a given string in order to get a string
* of a certain length.
*
* @param i a given number
* @param length the length of the resulting string
* @return the resulting string
*/
private static String SetLength(int i, int length) {
return i.ToString().PadLeft(length, '0');
}
/**
* Gives the W3C format of the PdfDate.
* @return a formatted date
*/
public String GetW3CDate() {
return GetW3CDate(value);
}
/**
* Gives the W3C format of the PdfDate.
* @param d the date in the format D:YYYYMMDDHHmmSSOHH'mm'
* @return a formatted date
*/
public static String GetW3CDate(String d) {
if (d.StartsWith("D:"))
d = d.Substring(2);
StringBuilder sb = new StringBuilder();
if (d.Length < 4)
return "0000";
sb.Append(d.Substring(0, 4)); //year
d = d.Substring(4);
if (d.Length < 2)
return sb.ToString();
sb.Append('-').Append(d.Substring(0, 2)); //month
d = d.Substring(2);
if (d.Length < 2)
return sb.ToString();
sb.Append('-').Append(d.Substring(0, 2)); //day
d = d.Substring(2);
if (d.Length < 2)
return sb.ToString();
sb.Append('T').Append(d.Substring(0, 2)); //hour
d = d.Substring(2);
if (d.Length < 2) {
sb.Append(":00Z");
return sb.ToString();
}
sb.Append(':').Append(d.Substring(0, 2)); //minute
d = d.Substring(2);
if (d.Length < 2) {
sb.Append('Z');
return sb.ToString();
}
sb.Append(':').Append(d.Substring(0, 2)); //second
d = d.Substring(2);
if (d.StartsWith("-") || d.StartsWith("+")) {
String sign = d.Substring(0, 1);
d = d.Substring(1);
String h = "00";
String m = "00";
if (d.Length >= 2) {
h = d.Substring(0, 2);
if (d.Length > 2) {
d = d.Substring(3);
if (d.Length >= 2)
m = d.Substring(0, 2);
}
sb.Append(sign).Append(h).Append(':').Append(m);
return sb.ToString();
}
}
sb.Append('Z');
return sb.ToString();
}
public static DateTime Decode(string date) {
if (date.StartsWith("D:"))
date = date.Substring(2);
int year, month = 1, day = 1, hour = 0, minute = 0, second = 0;
int offsetHour = 0, offsetMinute = 0;
char variation = '\0';
year = int.Parse(date.Substring(0, 4));
if (date.Length >= 6) {
month = int.Parse(date.Substring(4, 2));
if (date.Length >= 8) {
day = int.Parse(date.Substring(6, 2));
if (date.Length >= 10) {
hour = int.Parse(date.Substring(8, 2));
if (date.Length >= 12) {
minute = int.Parse(date.Substring(10, 2));
if (date.Length >= 14) {
second = int.Parse(date.Substring(12, 2));
}
}
}
}
}
DateTime d = new DateTime(year, month, day, hour, minute, second);
if (date.Length <= 14)
return d;
variation = date[14];
if (variation == 'Z')
return d.ToLocalTime();
if (date.Length >= 17) {
offsetHour = int.Parse(date.Substring(15, 2));
if (date.Length >= 20) {
offsetMinute = int.Parse(date.Substring(18, 2));
}
}
TimeSpan span = new TimeSpan(offsetHour, offsetMinute, 0);
if (variation == '-')
d += span;
else
d -= span;
return d.ToLocalTime();
}
}
}