DBMS_SCHEDULING Repeat Interval - Half Hourly, 9-5, Mon-Fri - oracle

I'm trying to work out if I can put together a repeat interval to apply to a Schedule that runs every half an hour between 9-5 on Monday to Friday.
I have this so far but am struggling to limit the time to within 9-5
FREQ=DAILY; BYDAY=MON,TUE,WED,THU,FRI; BYHOUR=9,10,11,12,13,14,15,16,17;BYMINUTE= 30;
If I run this, it will execute correctly during the 9-5 period; however, it will also execute every 30 minutes past every hour before 9 and after 5. I need to to only begin running >= 09:00 and <=17:00

I'd say that you're close - replace
BYMINUTE= 30
with
BYMINUTE= 0,30

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I need to complete timesheet of work until midnight of every last day of month. Since it's easy to forget, I want to set reminder on say 1PM of the last day. What's the correct syntax to configure it?
All my attempts either don't work or are clumsy:
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/remind me "Complete timesheet!!!" at 13:00 on the 31st of every month - works for 31-day-long months, ignores for shorter months
/remind me "Complete timesheet!!!" at 13:00 on the 30st of every month - (I guess) works every month except February, for 30-day-long months one can manually snooze by day
/remind me "Complete timesheet!!!" at -11:00 on the 1st of every month - sets 1st instead and does not completely understand
/remind me "Complete timesheet!!!" 11 hours before 1st day of every month - sets 1st instead and does not completely understand
12x copy of /remind me "Complete timesheet!!!" at 13:00 every November 30th for literally mentioned last day of every month - works but too lengthy
I will also accept answer with link to any documentation with formalized syntax of /remind command (BNF, railroad diagram) from which the possibility of such command would be either provable or disprovable.

how to get airflow schedule right

I found very confusing about how the airflow schedule works.
I would like to schedule a dag that runs on Friday and I would like use its result on Saturday. So I did the crontab expression like this: 00 16 * * 5, however, as of today 2020-03-10, the last execution date I got from airflow run is 2020-02-28. This is not desired as the most recent Friday is actually 2020-03-06, I couldn't get the 2020-03-06 to run unless I schedule it every day and skip it if it is not Friday. Is there a way to do this schedule right?
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Think of it like this: If you ran a process quarterly and generated a report from data for that quarter, would you name the report for the quarter you were in when you created the file, or for the quarter the data in the report is from? That's what the execution_date is.
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can a scheduled Cron job in Linux server run on every 1st day of the month and also on a specific day of the week

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00 02 * * 2 - This will restart the script every week (Tuesday).
Can a single cron entry replace these two above separate schedules? or do we need two separate schedules always to achieve the same?
If I have a use case to restart the script on 1st of every month and also on every Tuesday, it would be helpful if I can replace those two entries with one
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Your answer is yes... man 5 crontab explains:
Commands are executed by cron(8) when the 'minute', 'hour', and
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Where the order is:
field allowed values
----- --------------
minute 0-59
hour 0-23
day of month 1-31
month 1-12 (or names, see below)
day of week 0-7 (0 or 7 is Sunday, or use names)
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Since the crontab will run when either 'day of month', or 'day of week' match the current time, you may combine them for the result you want, e.g.
0 2 1 * 2 your_command
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something like below:
$schedule->command('log:test')->cron('* * 1-10 * *');
seems cron() is not getting executed... though everyMinute() is working fine... How can I get this to work?
You have to fill the hour and minutes on the cron.
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