getting max value from running total by month

I have written the following query in sql server 2017 which gives me the running total of a field called numberchecked for day, month, and year and this works perfectly.  I now need the max total, by month, but am a little bit brain fogged on how to get this.  My query is below.  What do I need to add?

Table has 2 fields:
    date datetime,
    numberchecked int

select date,
		sum(numberchecked) over (partition by date order by date) as rt,
		sum(numberchecked) over (partition by datepart(month, date) order by date) as rtm,
		sum(numberchecked) over (partition by datepart(year, date) order by date) as rty
from Checked
where datepart(year, date) = 2017

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dan hendersonAsked:
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Kyle AbrahamsSenior .Net DeveloperCommented:
is it just as easy as:
max(numberchecked) over (partition by datepart(month, date) ) as rtmAx,

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Don't have 2017 to check it out.
Olaf DoschkeSoftware DeveloperCommented:
I assume you'd also want to get rid of all the days not at the end of the month, so just first sum grouped by month, then do the running total:

With monthly as(
select max(date) as lastdate, 
       sum(numberchecked) as tm
	    from Checked
where    datepart( year, date) = 2017
group by datepart(month, date)
Select lastdate,
	sum(tm) over (partition by datepart(month, lastdate) order by lastdate) as rtm,
	sum(tm) over (partition by datepart( year, lastdate) order by lastdate) as rty
from monthly

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Bye, Olaf.

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dan hendersonAuthor Commented:
thanks.  I was having a brain cramp there.
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