Recurrence rule generates infinite loop even with constraint set

[tasso85]

I have the following recurrence rule:

$rule = "FREQ=YEARLY;DTSTART=20180101T000000;INTERVAL=1;BYDAY=MO,TU,WE,TH,FR,SA,SU;BYMONTH=1;BYSETPOS=+1"

The rule should "mean": from the first of January 2018, yearly every first day of January.

When I try to transform it with:

$transformer = new ArrayTransformer(new ArrayTransformerConfig);
$transformer->transform(new Rule($rule), new BetweenConstraint(new Date('2018-01-01 00:00:00'), new Date('2018-12-31 23:59:59'), true), false);

It gets into an infinite loop in which it never tests the constraint and does not honor the transformer "virtual limit".

While I agree that having all seven days listed in the "BYDAY" part is strange, the rule itself should be valid, and I do not understand why it fails; as soon as you remove at least one day from the "BYDAY" part, it works properly.

[tasso85]

I stand corrected, I tried a slightly different rule:

FREQ=YEARLY;DTSTART=20180101T000000;BYMONTH=1;INTERVAL=1;BYDAY=MO,TU,WE,TH,FR,SA;BYSETPOS=+1

That is, same as above without sunday, and the generated dates are:

/opt/agews64/www/sandbox.php(9) : eval()'d code:5:
object(Recurr\RecurrenceCollection)[2207]
  private 'elements' (Doctrine\Common\Collections\ArrayCollection) => 
    array (size=732)
      0 => 
        object(Recurr\Recurrence)[742]
          protected 'start' => 
            object(DateTime)[8]
              public 'date' => string '2023-01-02 00:00:00.000000' (length=26)
              public 'timezone_type' => int 3
              public 'timezone' => string 'Europe/Rome' (length=11)
          protected 'end' => 
            object(DateTime)[740]
              public 'date' => string '2023-01-02 00:00:00.000000' (length=26)
              public 'timezone_type' => int 3
              public 'timezone' => string 'Europe/Rome' (length=11)
          protected 'index' => int 1
      1 => 
        object(Recurr\Recurrence)[746]
          protected 'start' => 
            object(DateTime)[10]
              public 'date' => string '2034-01-02 00:00:00.000000' (length=26)
              public 'timezone_type' => int 3
              public 'timezone' => string 'Europe/Rome' (length=11)
          protected 'end' => 
            object(DateTime)[744]
              public 'date' => string '2034-01-02 00:00:00.000000' (length=26)
              public 'timezone_type' => int 3
              public 'timezone' => string 'Europe/Rome' (length=11)
          protected 'index' => int 2
      2 => 
        object(Recurr\Recurrence)[748]
          protected 'start' => 
            object(DateTime)[9]
              public 'date' => string '2040-01-02 00:00:00.000000' (length=26)
              public 'timezone_type' => int 3
              public 'timezone' => string 'Europe/Rome' (length=11)
          protected 'end' => 
            object(DateTime)[747]
              public 'date' => string '2040-01-02 00:00:00.000000' (length=26)
              public 'timezone_type' => int 3
              public 'timezone' => string 'Europe/Rome' (length=11)
          protected 'index' => int 3
      3 => 
        object(Recurr\Recurrence)[750]
          protected 'start' => 
            object(DateTime)[12]
              public 'date' => string '2045-01-02 00:00:00.000000' (length=26)
              public 'timezone_type' => int 3
              public 'timezone' => string 'Europe/Rome' (length=11)
          protected 'end' => 
            object(DateTime)[749]
              public 'date' => string '2045-01-02 00:00:00.000000' (length=26)
              public 'timezone_type' => int 3
              public 'timezone' => string 'Europe/Rome' (length=11)
          protected 'index' => int 4
      [...]
      731 => 
        object(Recurr\Recurrence)[2206]
          protected 'start' => 
            object(DateTime)[741]
              public 'date' => string '7065-01-02 00:00:00.000000' (length=26)
              public 'timezone_type' => int 3
              public 'timezone' => string 'Europe/Rome' (length=11)
          protected 'end' => 
            object(DateTime)[2205]
              public 'date' => string '7065-01-02 00:00:00.000000' (length=26)
              public 'timezone_type' => int 3
              public 'timezone' => string 'Europe/Rome' (length=11)
          protected 'index' => int 732

I really do not understand such result, should the rule simply indicate the first day (excluding sunday) of January each year?

EDIT: changing the "BYSETPOS" to anything different from "+1" seems to work as expected.

[tasso85]

After performing further tests, it seems that the issue is on "YEARLY" rules with "BYMONTH=1", "BYDAY=..." and "BYSETPOS" different from "+1", in fact using for example "BYMONTH=2" the rule works again.

In fact rule FREQ=YEARLY;DTSTART=20180101T000000;BYMONTH=1;INTERVAL=1;BYDAY=MO,TU,WE,TH,FR;BYSETPOS=+1 yields

array (
  0 => '2022-01-03',
  1 => '2023-01-02',
  2 => '2028-01-03',
  3 => '2033-01-03',
  4 => '2034-01-02',
  5 => '2039-01-03',
  6 => '2040-01-02',
  7 => '2045-01-02',
  8 => '2050-01-03',
  9 => '2051-01-02',
  10 => '2056-01-03',
  ...
  731 => '4585-01-03',
)

while rule FREQ=YEARLY;DTSTART=20180101T000000;BYMONTH=2;INTERVAL=1;BYDAY=MO,TU,WE,TH,FR;BYSETPOS=+1 yields

array (
  0 => '2018-02-01',
  1 => '2019-02-01',
  2 => '2020-02-03',
  3 => '2021-02-01',
  4 => '2022-02-01',
  5 => '2023-02-01',
  6 => '2024-02-01',
  7 => '2025-02-03',
  8 => '2026-02-02',
  9 => '2027-02-01',
  10 => '2028-02-01',
  ...
  731 => '2749-02-01',
)

[LeonAlvarez]

"FREQ=WEEKLY;DTSTART=20200304T153337;DTEND=20200307T192637;INTERVAL=2;BYDAY=TU,WE"

      719 => Recurr\Recurrence^ {#3382 …3}
      720 => Recurr\Recurrence^ {#3384 …3}
      721 => Recurr\Recurrence^ {#3386 …3}
      722 => Recurr\Recurrence^ {#3388 …3}
      723 => Recurr\Recurrence^ {#3390 …3}
      724 => Recurr\Recurrence^ {#3392 …3}
      725 => Recurr\Recurrence^ {#3394 …3}
      726 => Recurr\Recurrence^ {#3396 …3}
      727 => Recurr\Recurrence^ {#3398 …3}
      728 => Recurr\Recurrence^ {#3400 …3}
      729 => Recurr\Recurrence^ {#3402 …3}
      730 => Recurr\Recurrence^ {#3404 …3}
      731 => Recurr\Recurrence^ {#3406 …3}```
Im also getting 732 with this rule, could be related? any idea