D Documentation  
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  1. Introduction
    1. A simple tutorial
    2. Switching to D
    3. An advanced tutorial
  2. Language Reference
    1. General syntax
    2. Statements
    3. Types
    4. Error Handling
    5. Memory Management
  3. Std. runtime library (Phobos)
    1. std.base64
    2. std.boxer
    3. std.compiler
    4. std.conv
    5. std.ctype
    6. std.date
      1. d_time
      2. TicksPerSecond
      3. toString
      4. toUTCString
      5. toDateString
      6. toTimeString
      7. parse
      8. toISO8601YearWeek
      9. UTCtoLocalTime
      10. LocalTimetoUTC
      11. getUTCtime
      12. DosFileTime
      13. toDtime
      14. toDosFileTime
    7. std.file
    8. std.format
    9. std.gc
    10. std.intrinsic
    11. std.math
    12. std.md5
    13. std.mmfile
    14. std.outbuffer
    15. std.path
    16. std.process
    17. std.random
    18. std.recls
    19. std.regexp
    20. std.socket
    21. std.socketstream
    22. std.stdint
    23. std.stdio
    24. std.stream
    25. std.string
    26. std.system
    27. std.thread
    28. std.uri
    29. std.utf
    30. std.zip
    31. std.zlib
  4. Libraries and Tools
    1. mango
    2. Build
  5. Related Links
  6. About this documentation
toISO8601YearWeek 
void toISO8601YearWeek(long t, out int year, out int week);


It calculates year and week (1 - 53) from t. The ISO 8601 week 1 is the first week of the year that includes January 4. The first day of the week is monday.

Example
import std.date;
import std.stdio;

int main()	{
	int year, week;
	toISO8601YearWeek( 1333, year, week );
	writef( year, '\n', week );
	return 0;
}
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