[Remind-Fans] reminder every half hour

[Reid Thompson]

On 1/25/2010 5:45 PM, Tarlika Elisabeth Schmitz wrote:
> Hello Reid,
>
> On Tue, 19 Jan 2010 19:59:33 -0500
> Reid Thompson<reid.thompson at ateb.com>  wrote:
>
>> On Wed, Jan 20, 2010 at 12:07:38AM +0000, Tarlika Elisabeth Schmitz
>> wrote:
>>> > From 10:00 to midnight, I would like a 1/2-hourly reminder to check
>>> whether I need to put another log on the fire.
>>>
>>> I tried REM AT 10:00 *30 MSG check fire
>>>
>>> but that doesn't do anything. Am I missing something obvious?
>>>
>>
>> [...]
>>
>> The AT keyword introduces an AT clause.   The 17:00 means that the
>> trigger time is 5:00 PM. The +15 means Remind starts carping at you
>> fifteen minutes ahead of time, and the *3 means it annoys you every
>> three minutes.
>
> What caught me out is the fact that you can have a forward repeat for
> dates but not for times, e.g.
>
> REM 22 Jan 2010 *1 MSG do this everyday
>
> whereas the timed reminder with a trepeat will stop at the specified
> time.
>
> Therefore, as you suggest below, I have to specify the end time, and
> work my way back.
>
>> so i think you want
>>
>> REM AT 12:00 +120 *30 MSG check fire
>
> In principle, this is what I want, but from 10:00 (am) to midnight. How
> do I express midnight? I tried 24:00 and 00:00 - neither work. I seem
> to remember that timed reminders can't span midnight. Maybe that's the
> problem.
>
My quick fix would be to
REM AT 11:59 +840 *30 MSG check fire

10 am to midnight is 14 hours
14 * 60 = 840 minutes
add or subtract one minute to get the reminder at the half hour mark