function DateRepeat::testDateRepeat in Date 6

Same name and namespace in other branches

1. 5.2 tests/date_repeat.test \DateRepeat::testDateRepeat()

File

tests/date_repeat.test, line 12

Class

DateRepeat

Test PHP 4 Timezone Conversion

Code

function testDateRepeat() {
  include_once './' . drupal_get_path('module', 'date_api') . '/date_api_ical.inc';
  include_once './' . drupal_get_path('module', 'date_repeat') . '/date_repeat_calc.inc';

  // Examples adapted from http://www.faqs.org/rfcs/rfc2445.html and
  // http://www.kanzaki.com/docs/ical/rrule.html.
  //  Daily for 10 occurrences:
  $start = "1997-09-02 09:00:00";
  $end = "1997-09-30 09:00:00";
  $rule = "RRULE:FREQ=DAILY;COUNT=10";
  $dates = date_repeat_calc($rule, $start, $end, array());

  //  should be (1997 9:00 AM EDT)September 2-11
  $shouldbe = '1997-09-02 09:00:00, 1997-09-03 09:00:00, 1997-09-04 09:00:00, 1997-09-05 09:00:00, 1997-09-06 09:00:00, 1997-09-07 09:00:00, 1997-09-08 09:00:00, 1997-09-09 09:00:00, 1997-09-10 09:00:00, 1997-09-11 09:00:00';
  $result = implode(', ', $dates);
  $this
    ->assertEqual($result, $shouldbe, $rule . '; Starting ' . $start . ';  results: ' . $result);

  //Daily until September 24, 1997:
  $start = "1997-09-02 09:00:00";
  $end = "1997-09-30 09:00:00";
  $rule = "RRULE:FREQ=DAILY;UNTIL=19970924T000000Z";
  $dates = date_repeat_calc($rule, $start, $end, array());

  //  should be (1997 9:00 AM EDT)September 2-23
  $shouldbe = '1997-09-02 09:00:00, 1997-09-03 09:00:00, 1997-09-04 09:00:00, 1997-09-05 09:00:00, 1997-09-06 09:00:00, 1997-09-07 09:00:00, 1997-09-08 09:00:00, 1997-09-09 09:00:00, 1997-09-10 09:00:00, 1997-09-11 09:00:00, 1997-09-12 09:00:00, 1997-09-13 09:00:00, 1997-09-14 09:00:00, 1997-09-15 09:00:00, 1997-09-16 09:00:00, 1997-09-17 09:00:00, 1997-09-18 09:00:00, 1997-09-19 09:00:00, 1997-09-20 09:00:00, 1997-09-21 09:00:00, 1997-09-22 09:00:00, 1997-09-23 09:00:00';
  $result = implode(', ', $dates);
  $this
    ->assertEqual($result, $shouldbe, $rule . '; Starting ' . $start . ';  results: ' . $result);

  //Every other day - until September 30:
  $start = "1997-09-02 09:00:00";
  $end = "1997-09-30 09:00:00";
  $rule = "RRULE:FREQ=DAILY;INTERVAL=2";
  $dates = date_repeat_calc($rule, $start, $end, array());

  // should be (1997 9:00 AM EDT)September2,4,6,8...24,26,28,30;
  $shouldbe = '1997-09-02 09:00:00, 1997-09-04 09:00:00, 1997-09-06 09:00:00, 1997-09-08 09:00:00, 1997-09-10 09:00:00, 1997-09-12 09:00:00, 1997-09-14 09:00:00, 1997-09-16 09:00:00, 1997-09-18 09:00:00, 1997-09-20 09:00:00, 1997-09-22 09:00:00, 1997-09-24 09:00:00, 1997-09-26 09:00:00, 1997-09-28 09:00:00, 1997-09-30 09:00:00';
  $result = implode(', ', $dates);
  $this
    ->assertEqual($result, $shouldbe, $rule . '; Starting ' . $start . ';  results: ' . $result);

  //Every 10 days, 2 occurrences:
  $start = "1997-09-02 09:00:00";
  $end = "1997-09-30 09:00:00";
  $rule = "RRULE:FREQ=DAILY;INTERVAL=10;COUNT=2";
  $dates = date_repeat_calc($rule, $start, $end, array());

  //  should be (1997 9:00 AM EDT)September 2,12
  $shouldbe = '1997-09-02 09:00:00, 1997-09-12 09:00:00';
  $result = implode(', ', $dates);
  $this
    ->assertEqual($result, $shouldbe, $rule . '; Starting ' . $start . ';  results: ' . $result);

  //Weekly for 3 occurrences
  $start = "1997-09-02 09:00:00";
  $end = "1997-09-30 09:00:00";
  $rule = "RRULE:FREQ=WEEKLY;COUNT=3";
  $dates = date_repeat_calc($rule, $start, $end, array());

  //  should be (1997 9:00 AM EDT)September 2,9,16
  $shouldbe = '1997-09-02 09:00:00, 1997-09-09 09:00:00, 1997-09-16 09:00:00';
  $result = implode(', ', $dates);
  $this
    ->assertEqual($result, $shouldbe, $rule . '; Starting ' . $start . ';  results: ' . $result);

  //Weekly until September 24, 1997
  $start = "1997-09-02 09:00:00";
  $end = "1997-09-30 09:00:00";
  $rule = "RRULE:FREQ=WEEKLY;UNTIL=19970924T000000Z";

  //  ==> (1997 9:00 AM EDT)September 2,9,16,23
  $dates = date_repeat_calc($rule, $start, $end, array());
  $shouldbe = '1997-09-02 09:00:00, 1997-09-09 09:00:00, 1997-09-16 09:00:00, 1997-09-23 09:00:00';
  $result = implode(', ', $dates);
  $this
    ->assertEqual($result, $shouldbe, $rule . '; Starting ' . $start . ';  results: ' . $result);

  //Every other week - forever:
  $start = "1997-09-02 09:00:00";
  $end = "1997-09-30 09:00:00";
  $rule = "RRULE:FREQ=WEEKLY;INTERVAL=2;WKST=SU";

  //  should be (1997 9:00 AM EDT)September 2,16,30
  $dates = date_repeat_calc($rule, $start, $end, array());
  $shouldbe = '1997-09-02 09:00:00, 1997-09-16 09:00:00, 1997-09-30 09:00:00';
  $result = implode(', ', $dates);
  $this
    ->assertEqual($result, $shouldbe, $rule . '; Starting ' . $start . ';  results: ' . $result);

  //Weekly on Tuesday and Thursday for 4 weeks:
  $start = "1997-09-02 09:00:00";
  $end = "1997-09-30 09:00:00";
  $rule = "RRULE:FREQ=WEEKLY;COUNT=8;WKST=SU;BYDAY=TU,TH";

  // should be(1997 9:00 AM EDT)September 2,4,9,11,16,18,23,25
  $dates = date_repeat_calc($rule, $start, $end, array());
  $shouldbe = '1997-09-02 09:00:00, 1997-09-04 09:00:00, 1997-09-09 09:00:00, 1997-09-11 09:00:00, 1997-09-16 09:00:00, 1997-09-18 09:00:00, 1997-09-23 09:00:00, 1997-09-25 09:00:00';
  $result = implode(', ', $dates);
  $this
    ->assertEqual($result, $shouldbe, $rule . '; Starting ' . $start . ';  results: ' . $result);

  //Every other week on Tuesday and Thursday, for 5 occurrences:
  $start = "1997-09-02 09:00:00";
  $end = "1997-09-30 09:00:00";
  $rule = "RRULE:FREQ=WEEKLY;INTERVAL=2;COUNT=5;WKST=SU;BYDAY=TU,TH";

  //  should be  (1997 9:00 AM EDT)September 2,4,16,18,30
  $dates = date_repeat_calc($rule, $start, $end, array());
  $shouldbe = '1997-09-02 09:00:00, 1997-09-04 09:00:00, 1997-09-16 09:00:00, 1997-09-18 09:00:00, 1997-09-30 09:00:00';
  $result = implode(', ', $dates);
  $this
    ->assertEqual($result, $shouldbe, $rule . '; Starting ' . $start . ';  results: ' . $result);

  //Every other week on Monday, Wednesday and Friday until September 24, 1997,
  $start = "1997-09-02 09:00:00";
  $end = "1997-09-30 09:00:00";
  $rule = "RRULE:FREQ=WEEKLY;INTERVAL=2;UNTIL=19970924T000000Z;WKST=SU;BYDAY=MO,WE,FR";

  // should be (1997 9:00 AM EDT)September 2,3,5,15,17,19
  $dates = date_repeat_calc($rule, $start, $end, array());
  $shouldbe = '1997-09-02 09:00:00, 1997-09-03 09:00:00, 1997-09-05 09:00:00, 1997-09-15 09:00:00, 1997-09-17 09:00:00, 1997-09-19 09:00:00';
  $result = implode(', ', $dates);
  $this
    ->assertEqual($result, $shouldbe, $rule . '; Starting ' . $start . ';  results: ' . $result);

  //Monthly on the 1st Friday for 2 occurrences:
  $start = "1997-09-05 09:00:00";
  $end = "1997-10-31 09:00:00";
  $rule = "RRULE:FREQ=MONTHLY;COUNT=2;BYDAY=1FR";

  //  should be (1997 9:00 AM EDT)September 5;October 3
  $dates = date_repeat_calc($rule, $start, $end, array());
  $shouldbe = '1997-09-05 09:00:00, 1997-10-03 09:00:00';
  $result = implode(', ', $dates);
  $this
    ->assertEqual($result, $shouldbe, $rule . '; Starting ' . $start . ';  results: ' . $result);

  //Monthly on the 1st Friday until December 24, 1997:
  $start = "1997-09-05 09:00:00";
  $end = "1998-10-01 09:00:00";
  $rule = "RRULE:FREQ=MONTHLY;UNTIL=19971224T000000Z;BYDAY=1FR";
  $dates = date_repeat_calc($rule, $start, $end, array());
  $shouldbe = '1997-09-05 09:00:00, 1997-10-03 09:00:00, 1997-11-07 09:00:00, 1997-12-05 09:00:00';
  $result = implode(', ', $dates);
  $this
    ->assertEqual($result, $shouldbe, $rule . '; Starting ' . $start . ';  results: ' . $result);

  //Every other month on the 1st and last Sunday of the month for 10 occurrences:
  $start = "1997-09-07 09:00:00";
  $end = "1998-10-01 09:00:00";
  $rule = "RRULE:FREQ=MONTHLY;INTERVAL=2;COUNT=10;BYDAY=1SU,-1SU";

  //  ==> (1997 9:00 AM EDT)September 7,28
  //      (1997 9:00 AM EST)November 2,30
  //      (1998 9:00 AM EST)January 4,25;March 1,29
  //      (1998 9:00 AM EDT)May 3,31
  $dates = date_repeat_calc($rule, $start, $end, array());
  $shouldbe = '1997-09-07 09:00:00, 1997-09-28 09:00:00, 1997-11-02 09:00:00, 1997-11-30 09:00:00, 1998-01-04 09:00:00, 1998-01-25 09:00:00, 1998-03-01 09:00:00, 1998-03-29 09:00:00, 1998-05-03 09:00:00, 1998-05-31 09:00:00';
  $result = implode(', ', $dates);
  $this
    ->assertEqual($result, $shouldbe, $rule . '; Starting ' . $start . ';  results: ' . $result);

  //Monthly on the second to last Monday of the month for 6 months:
  $start = "1997-09-22 09:00:00";
  $end = "1998-10-01 09:00:00";
  $rule = "RRULE:FREQ=MONTHLY;COUNT=6;BYDAY=-2MO";

  //==> (1997 9:00 AM EDT)September 22;October 20

  //  (1997 9:00 AM EST)November 17;December 22
  //  (1998 9:00 AM EST)January 19;February 16
  $dates = date_repeat_calc($rule, $start, $end, array());
  $shouldbe = '1997-09-22 09:00:00, 1997-10-20 09:00:00, 1997-11-17 09:00:00, 1997-12-22 09:00:00, 1998-01-19 09:00:00, 1998-02-16 09:00:00';
  $result = implode(', ', $dates);
  $this
    ->assertEqual($result, $shouldbe, $rule . '; Starting ' . $start . ';  results: ' . $result);

  //Every Tuesday, every other month:
  $start = "1997-09-02 09:00:00";
  $end = "1998-02-01 09:00:00";
  $rule = "RRULE:FREQ=MONTHLY;INTERVAL=2;BYDAY=TU";

  //  ==> (1997 9:00 AM EDT)September 2,9,16,23,30
  //      (1997 9:00 AM EST)November 4,11,18,25
  //      (1998 9:00 AM EST)January 6,13,20,27;March 3,10,17,24,31
  $dates = date_repeat_calc($rule, $start, $end, array());
  $shouldbe = '1997-09-02 09:00:00, 1997-09-09 09:00:00, 1997-09-16 09:00:00, 1997-09-23 09:00:00, 1997-09-30 09:00:00, 1997-11-04 09:00:00, 1997-11-11 09:00:00, 1997-11-18 09:00:00, 1997-11-25 09:00:00, 1998-01-06 09:00:00, 1998-01-13 09:00:00, 1998-01-20 09:00:00, 1998-01-27 09:00:00';
  $result = implode(', ', $dates);
  $this
    ->assertEqual($result, $shouldbe, $rule . '; Starting ' . $start . ';  results: ' . $result);

  //Yearly in June and July for 10 occurrences:
  $start = "1997-06-10 09:00:00";
  $end = "2002-01-01 09:00:00";
  $rule = "RRULE:FREQ=YEARLY;COUNT=10;BYMONTH=6,7";

  //  ==> (1997 9:00 AM EDT)June 10;July 10
  //      (1998 9:00 AM EDT)June 10;July 10
  //      (1999 9:00 AM EDT)June 10;July 10
  //      (2000 9:00 AM EDT)June 10;July 10
  //      (2001 9:00 AM EDT)June 10;July 10
  //  Note: Since none of the BYDAY, BYMONTHDAY or BYYEARDAY components
  //  are specified, the day is gotten from DTSTART
  $dates = date_repeat_calc($rule, $start, $end, array());
  $shouldbe = '1997-06-10 09:00:00, 1997-07-10 09:00:00, 1998-06-10 09:00:00, 1998-07-10 09:00:00, 1999-06-10 09:00:00, 1999-07-10 09:00:00, 2000-06-10 09:00:00, 2000-07-10 09:00:00, 2001-06-10 09:00:00, 2001-07-10 09:00:00';
  $result = implode(', ', $dates);
  $this
    ->assertEqual($result, $shouldbe, $rule . '; Starting ' . $start . ';  results: ' . $result);

  //Every other year on January, February, and March for 10 occurrences:
  $start = "1997-03-10 09:00:00";
  $end = "2004-01-01 09:00:00";
  $rule = "RRULE:FREQ=YEARLY;INTERVAL=2;COUNT=10;BYMONTH=1,2,3";

  //  ==> (1997 9:00 AM EST)March 10
  //      (1999 9:00 AM EST)January 10;February 10;March 10
  //      (2001 9:00 AM EST)January 10;February 10;March 10
  //      (2003 9:00 AM EST)January 10;February 10;March 10
  $dates = date_repeat_calc($rule, $start, $end, array());
  $shouldbe = '1997-03-10 09:00:00, 1999-01-10 09:00:00, 1999-02-10 09:00:00, 1999-03-10 09:00:00, 2001-01-10 09:00:00, 2001-02-10 09:00:00, 2001-03-10 09:00:00, 2003-01-10 09:00:00, 2003-02-10 09:00:00, 2003-03-10 09:00:00';
  $result = implode(', ', $dates);
  $this
    ->assertEqual($result, $shouldbe, $rule . '; Starting ' . $start . ';  results: ' . $result);

  //An example where the days generated makes a difference because of WKST:
  $start = "1997-08-05 09:00:00";
  $end = "2004-01-01 09:00:00";
  $rule = "RRULE:FREQ=WEEKLY;INTERVAL=2;COUNT=4;BYDAY=TU,SU;WKST=MO";

  //  ==> (1997 EDT)Aug 5,10,19,24
  $dates = date_repeat_calc($rule, $start, $end, array());
  $shouldbe = '1997-08-05 09:00:00, 1997-08-10 09:00:00, 1997-08-19 09:00:00, 1997-08-24 09:00:00';
  $result = implode(', ', $dates);
  $this
    ->assertEqual($result, $shouldbe, $rule . '; Starting ' . $start . ';  results: ' . $result);

  //changing only WKST from MO to SU, yields different results...
  $start = "1997-08-05 09:00:00";
  $end = "2004-01-01 09:00:00";
  $rule = "RRULE:FREQ=WEEKLY;INTERVAL=2;COUNT=4;BYDAY=TU,SU;WKST=SU";

  // Result: 1997 EDT August 5,17,19,31;
  $dates = date_repeat_calc($rule, $start, $end, array());
  $shouldbe = '1997-08-05 09:00:00, 1997-08-17 09:00:00, 1997-08-19 09:00:00, 1997-08-31 09:00:00';
  $result = implode(', ', $dates);
  $this
    ->assertEqual($result, $shouldbe, $rule . '; Starting ' . $start . ';  results: ' . $result);

  //Every 18 months on the 10th thru 15th of the month for 10 occurrences:
  $start = "1997-09-10 09:00:00";
  $end = "2004-01-01 09:00:00";
  $rule = "RRULE:FREQ=MONTHLY;INTERVAL=18;COUNT=10;BYMONTHDAY=10,11,12,13,14,15";

  //  ==> (1997 9:00 AM EDT)September 10,11,12,13,14,15
  //      (1999 9:00 AM EST)March 10,11,12,13
  $dates = date_repeat_calc($rule, $start, $end, array());
  $shouldbe = '1997-09-10 09:00:00, 1997-09-11 09:00:00, 1997-09-12 09:00:00, 1997-09-13 09:00:00, 1997-09-14 09:00:00, 1997-09-15 09:00:00, 1999-03-10 09:00:00, 1999-03-11 09:00:00, 1999-03-12 09:00:00, 1999-03-13 09:00:00';
  $result = implode(', ', $dates);
  $this
    ->assertEqual($result, $shouldbe, $rule . '; Starting ' . $start . ';  results: ' . $result);

  //Monthly on the third to the last day of the month, forever:
  $start = "1997-09-28 09:00:00";
  $end = "1998-03-01 09:00:00";
  $rule = "RRULE:FREQ=MONTHLY;BYMONTHDAY=-3";

  //  ==> (1997 9:00 AM EDT)September 28
  //      (1997 9:00 AM EST)October 29;November 28;December 29
  //      (1998 9:00 AM EST)January 29;February 26
  $dates = date_repeat_calc($rule, $start, $end, array());
  $shouldbe = '1997-09-28 09:00:00, 1997-10-29 09:00:00, 1997-11-28 09:00:00, 1997-12-29 09:00:00, 1998-01-29 09:00:00, 1998-02-26 09:00:00';
  $result = implode(', ', $dates);
  $this
    ->assertEqual($result, $shouldbe, $rule . '; Starting ' . $start . ';  results: ' . $result);
  return;

  //Every Thursday in March, forever:
  $date = "DTSTART;TZID=US-Eastern:19970313T090000";
  $rule = "RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=TH";

  //  ==> (1997 9:00 AM EST)March 13,20,27
  //      (1998 9:00 AM EST)March 5,12,19,26
  //      (1999 9:00 AM EST)March 4,11,18,25

  //Every Thursday, but only during June, July, and August, forever:
  $date = "DTSTART;TZID=US-Eastern:19970605T090000";
  $rule = "RRULE:FREQ=YEARLY;BYDAY=TH;BYMONTH=6,7,8";

  //  ==> (1997 9:00 AM EDT)June 5,12,19,26;July 3,10,17,24,31;August 7,14,21,28
  //      (1998 9:00 AM EDT)June 4,11,18,25;July 2,9,16,23,30;August 6,13,20,27
  //      (1999 9:00 AM EDT)June 3,10,17,24;July 1,8,15,22,29;August 5,12,19,26

  //Monthly on the 2nd and 15th of the month for 10 occurrences:
  $date = "DTSTART;TZID=US-Eastern:19970902T090000";
  $rule = "RRULE:FREQ=MONTHLY;COUNT=10;BYMONTHDAY=2,15";

  //  ==> (1997 9:00 AM EDT)September 2,15;October 2,15
  //      (1997 9:00 AM EST)November 2,15;December 2,15
  //      (1998 9:00 AM EST)January 2,15

  //Monthly on the first and last day of the month for 10 occurrences:
  $date = "DTSTART;TZID=US-Eastern:19970930T090000";
  $rule = "RRULE:FREQ=MONTHLY;COUNT=10;BYMONTHDAY=1,-1";

  //  ==> (1997 9:00 AM EDT)September 30;October 1
  //      (1997 9:00 AM EST)October 31;November 1,30;December 1,31
  //      (1998 9:00 AM EST)January 1,31;February 1

  //Every Friday the 13th, forever:
  $date = "DTSTART;TZID=US-Eastern:19970902T090000";
  $rule = "EXDATE;TZID=US-Eastern:19970902T090000";
  $rule = "RRULE:FREQ=MONTHLY;BYDAY=FR;BYMONTHDAY=13";

  //  ==> (1998 9:00 AM EST)February 13;March 13;November 13
  //      (1999 9:00 AM EDT)August 13
  //      (2000 9:00 AM EDT)October 13

  //The first Saturday that follows the first Sunday of the month, forever:
  $date = "DTSTART;TZID=US-Eastern:19970913T090000";
  $rule = "RRULE:FREQ=MONTHLY;BYDAY=SA;BYMONTHDAY=7,8,9,10,11,12,13";

  //  ==> (1997 9:00 AM EDT)September 13;October 11
  //      (1997 9:00 AM EST)November 8;December 13
  //      (1998 9:00 AM EST)January 10;February 7;March 7
  //      (1998 9:00 AM EDT)April 11;May 9;June 13...

  //Every four years, the first Tuesday after a Monday in November,

  //forever (U.S. Presidential Election day):
  $date = "DTSTART;TZID=US-Eastern:19961105T090000";
  $rule = "RRULE:FREQ=YEARLY;INTERVAL=4;BYMONTH=11;BYDAY=TU;BYMONTHDAY=2,3,4,5,6,7,8";

  //  ==> (1996 9:00 AM EST)November 5
  //      (2000 9:00 AM EST)November 7
  //      (2004 9:00 AM EST)November 2
  // TODO:
  // BYYEARDAY, BYSETPOS,
  // BYHOUR, BYMINUTE, HOURLY, MINUTELY, SECONDLY
  // have not yet been implemented in date_repeat.

  //Every 20th Monday of the year, forever:
  $start = "1997-05-19 09:00:00";
  $end = "2002-01-01 09:00:00";
  $rule = "RRULE:FREQ=YEARLY;BYDAY=20MO";

  //  ==> (1997 9:00 AM EDT)May 19
  //      (1998 9:00 AM EDT)May 18
  //      (1999 9:00 AM EDT)May 17
  $dates = date_repeat_calc($rule, $start, $end, array());
  $shouldbe = '1997-03-10 09:00:00, 1999-01-10 00:00:00, 1999-02-10 00:00:00, 1999-03-10 00:00:00, 2001-01-10 00:00:00, 2001-02-10 00:00:00, 2001-03-10 00:00:00, 2003-01-10 00:00:00, 2003-02-10 00:00:00, 2003-03-10 00:00:00';
  $result = implode(', ', $dates);
  $this
    ->assertEqual($result, $shouldbe, $rule . '; Starting ' . $start . ';  results: ' . $result);

  //Every 3rd year on the 1st, 100th and 200th day for 10 occurrences:
  $date = "DTSTART;TZID=US-Eastern:19970101T090000";
  $rule = "RRULE:FREQ=YEARLY;INTERVAL=3;COUNT=10;BYYEARDAY=1,100,200";

  //  ==> (1997 9:00 AM EST)January 1
  //      (1997 9:00 AM EDT)April 10;July 19
  //      (2000 9:00 AM EST)January 1
  //      (2000 9:00 AM EDT)April 9;July 18
  //      (2003 9:00 AM EST)January 1
  //      (2003 9:00 AM EDT)April 10;July 19
  //      (2006 9:00 AM EST)January 1

  //Monday of week number 20 (where the default start of the week is Monday), forever:
  $date = "DTSTART;TZID=US-Eastern:19970512T090000";
  $rule = "RRULE:FREQ=YEARLY;BYWEEKNO=20;BYDAY=MO";

  //  ==> (1997 9:00 AM EDT)May 12
  //      (1998 9:00 AM EDT)May 11
  //      (1999 9:00 AM EDT)May 17

  //The 3rd instance into the month of one of Tuesday, Wednesday or

  //Thursday, for the next 3 months:
  $date = "DTSTART;TZID=US-Eastern:19970904T090000";
  $rule = "RRULE:FREQ=MONTHLY;COUNT=3;BYDAY=TU,WE,TH;BYSETPOS=3";

  //  ==> (1997 9:00 AM EDT)September 4;October 7
  //      (1997 9:00 AM EST)November 6

  //The 2nd to last weekday of the month:
  $date = "DTSTART;TZID=US-Eastern:19970929T090000";
  $rule = "RRULE:FREQ=MONTHLY;BYDAY=MO,TU,WE,TH,FR;BYSETPOS=-2";

  //  ==> (1997 9:00 AM EDT)September 29
  //      (1997 9:00 AM EST)October 30;November 27;December 30
  //      (1998 9:00 AM EST)January 29;February 26;March 30

  //Every 3 hours from 9:00 AM to 5:00 PM on a specific day:
  $date = "DTSTART;TZID=US-Eastern:19970902T090000";
  $rule = "RRULE:FREQ=HOURLY;INTERVAL=3;UNTIL=19970902T170000Z";

  //  ==> (September 2, 1997 EDT)09:00,12:00,15:00

  //Every 15 minutes for 6 occurrences:
  $date = "DTSTART;TZID=US-Eastern:19970902T090000";
  $rule = "RRULE:FREQ=MINUTELY;INTERVAL=15;COUNT=6";

  //  ==> (September 2, 1997 EDT)09:00,09:15,09:30,09:45,10:00,10:15

  //Every hour and a half for 4 occurrences:
  $date = "DTSTART;TZID=US-Eastern:19970902T090000";
  $rule = "RRULE:FREQ=MINUTELY;INTERVAL=90;COUNT=4";

  //  ==> (September 2, 1997 EDT)09:00,10:30;12:00;13:30

  //Every 20 minutes from 9:00 AM to 4:40 PM every day:
  $date = "DTSTART;TZID=US-Eastern:19970902T090000";
  $rule = "RRULE:FREQ=DAILY;BYHOUR=9,10,11,12,13,14,15,16;BYMINUTE=0,20,40";

  //  or
  $rule = "RRULE:FREQ=MINUTELY;INTERVAL=20;BYHOUR=9,10,11,12,13,14,15,16";

  //  ==> (September 2, 1997 EDT)9:00,9:20,9:40,10:00,10:20,16:00,16:20,16:40
  //      (September 3, 1997 EDT)9:00,9:20,9:40,10:00,10:20,16:00,16:20,16:40
}