Schedule has been set to update this table between 14th to 25th of every month Mon-Fri. Although, the build got triggered recently on 12th of August which shouldn't happen according to the specified CRON.
The culprit seems to be a limitation of the cron expression, outside of Foundry - specifically this part:
The day of a command's execution can be specified by two fields — day of month, and day of week. If both fields are restricted (i.e., aren't *), the command will be run when either field matches the current time. For example, ``30 4 1,15 * 5'' would cause a command to be run at 4:30 am on the 1st and 15th of each month, plus every Friday.
So the cron schedule 30 8 14-25 * 1-5 will run between the 14th and 25th of the month and every Monday through Friday. (See for example crontab.guru (https://crontab.guru/#30_8_14-25_*_1-5).)
The generated description for it is not accurate, unfortunately we don't have much control over it as we use a library to turn the cron expressions into human readable expressions.
Related:
https://unix.stackexchange.com/questions/602328/are-the-day-of-month-and-day-of-week-crontab-fields-mutually-exclusive
https://unix.stackexchange.com/questions/602216/when-will-an-interval-cron-execute-the-first-time-ex-3-days/602222#602222
https://blog.healthchecks.io/2022/09/schedule-cron-job-the-funky-way/
Related
I need an RRULE for every other Saturday except the last week of the month. I tried to create one with a weekly frequency, but didn't know how to apply an exception for the last week of the month:
RRULE:FREQ=MONTHLY;INTERVAL=1;BYDAY=SA
I also tried creating a rule with a monthly frequency, which allowed me to skip the last week of the month, but I didn't know how to make it every other week:
RRULE:FREQ=MONTHLY;INTERVAL=1;BYDAY=SA;BYSETPOS=-2,-3,-4,-5
I looked through the specification, but I'm not seeing anything that makes this possible.
The secret to the solution here is that BYMONTHDAY can be negative like BYSETPOS. This allows one to exclude the last 7 days of each month even though the number of days in the month varies. Your DTSTART should be on a SATURDAY, so one doesn't really need the BYDAY=SA
This rrule works in google calendar (if DTSTART is on Saturday and generally for any every 2nd week but not the last week rule for any day of week specified by the DTSTART):
RRULE:FREQ=WEEKLY;INTERVAL=2;BYMONTHDAY=-8,-9,-10,-11,-12,-13,-14,-15,-16,-17,-18,-19,-20,-21,-22,-23,-24,-25,-26,-27,-28,-29,-30,-31
See test calendar:
https://calendar.google.com/calendar/u/0?cid=ZXBwdWE4N2RwZm5xODVic3JydDJzaXFsY3NAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ
Spec: https://datatracker.ietf.org/doc/html/rfc2445#page-43
and
https://icalevents.com/2447-need-to-know-the-possible-combinations-for-repeating-dates-an-ical-cheatsheet/ for the expansion & contraction (limiting) rules & combinations
Using rfc5545 is there a way to represent an event that starts on the first day of each month and ends on the last day of each month and repeats every month?
It's slightly different than a daily repeating event which is not ideal for my use case.
short answer: No
This is driven by the fact that the RFC5545 clearly states that an event cannot have a month duration, only days, weeks or seconds.
3.3.6. Duration
[...] Note that unlike
[ISO.8601.2004], this value type doesn't support the "Y" and "M"
designators to specify durations in terms of years and months.
(emphasis mine)
It appears to me that both mean "any of the available values". What exactly in the difference between them?
* means every possible value in the field. ? means you don't care about the value. It's used when you have two fields that may contradict each other. The common example being the day of month and day of week fields. Consider, for example a cron specification for running at 10AM on the first day of every month:
0 0 10 1 * ? *
Now let's break it down:
Seconds: 0 - we want it to run on 10:00:00
Minutes: 0 - we want it to run on 10:00:00
Hours: 10 - we want it to run on 10:00:00
Day of month: 1 - we want it to run of the 1st of every month
Month: * - we want it to run on every month (e.g., January 1st, February 1st, etc.)
Day of week: ? - we don't care about the day of week. The cron should run on the 1st of every month, regardless of whether it's a Sunday, a Monday, etc.
Year: * - we want it to run on every year
From Quartz Scheduler
* ("all values") - used to select all values within a field. For example, "*" in the minute field means "every minute".
? ("no specific value") - useful when you need to specify something in
one of the two fields in which the character is allowed, but not the
other. For example, if I want my trigger to fire on a particular day
of the month (say, the 10th), but don't care what day of the week that
happens to be, I would put "10" in the day-of-month field, and "?" in
the day-of-week field. See the examples below for clarification.
The * character is used to specify all values. For example, "*" in the minute field means " every minute ".
The ? character is allowed for the day-of-month and day-of-week fields. It is used to specify 'no specific value'. This is useful when you need to specify something in one of the two fields, but not the other. See the examples below for clarification.
You can look more here:
http://docs.netkernel.org/book/view/book:mod:cron/doc:mod:cron:cronexpression
Also if you need to create a Cron expression you can use this: http://www.cronmaker.com/
* means every time. According to the position, it will be:
every second, minute, hour, day, month.
? means that it would be
chosen by other field. So ? doesn't add filter, but it
wouldn't run every time.
? is used for setting the day, as it might be a day of month or the day of week. So if you choose the day of month (like the 1-st day of month), than you put ? in the day of week, by which you show, that it would be not every day of week, but only those days which are allowed by other conditions. And vice versa, if you set day of week, you put ? in the day of month.
I'm trying to figure out how to setup quartz to run twice monthly specifying the day of week using the symbol "#".
My expression:
0 0 8 ? * 6#2,6#4
My goal is to run every second and fourth Friday of every month at 8:00
The expression is valid, but it runs only at forth Friday. The second one is ignored.
How to achieve this?
Thank you.
Unfortunately, there's not way now.
If the '#' character is used, there can only be one expression in the
day-of-week field ("3#1,6#3" is not valid, since there are two
expressions).
source: http://quartz-scheduler.org/api/2.2.0/org/quartz/CronExpression.html
if fourth is working fine. You can simply separate the two out and load the job again for second friday.
if API does not provide you the solution it always comes down to your implementation and code logic.
My app requires users to schedule recurring events that can recur daily, weekly, monthly, or bi-weekly.
By bi-weekly, I mean every fortnight (14 days) starting from an arbitrary date value provided at the time of creation.
My jobs table has two columns to support this: job_frequency_id and job_frequency_value. I'm able to schedule all types except for bi-weekly.
The first col is an FK to the job_frequencies table; it contains daily, weekly, monthy, bi-weekly values. The job_frequency_value contains the value corresponding to the frequency.
For example: If a job has a job_frquency_id == 3 and job_frequency_value == 10, it will run every 10th day of the month.
How do I add bi-weekly support without tampering with my db structure? I will use the job_frequency_value col to store the start date of the 14 day period, but I'm unsure of the calculation going forward.
Say your starting date is stored as a variable named 'createdDate'.
nextFortnight = DateAdd("ww", job_frequency_value*2, createdDate);
can you wrap your scheduled task in a and set it to run every week?
Something like
<cfif DateDiff('ww',CreateDate(2011,01,01),Today'sDate) MOD 2 EQ 1>
That way if the weeks are odd your scheduled task runs completely and if it's an odd week then it runs the scheduled task, but ignore all your code.