[R] How to get last day of a month?

[Diethelm Wuertz]

jim holtman wrote:

just use timeDate from Rmetrics, there you will find several functions 
like ...

#  timeLastDayInMonth        Computes the last day in a given month and year
#  timeFirstDayInMonth       Computes the first day in a given month and 
year
#  timeLastDayInQuarter      Computes the last day in a given quarter 
and year
#  timeFirstDayInQuarter     Computes the first day in a given quarter 
and year

#  timeNthNdayInMonth        Computes n-th ocurrance of a n-day in 
year/month
#  timeLastNdayInMonth       Computes the last n-day in year/month

and many more ...

Diethelm Wuertz


> Does this help.  Shows how to use the basic functions to get at the answer:
>
>   
>> # add first day of month to make it valid
>> x <- as.POSIXct(paste('1', 'sep2009', sep=''), format="%d%b%Y")
>> # now advance one month and then go back one day for the end of the month
>> next.mon <- seq(x, length=2, by='1 month')[2]
>> last.day <- seq(next.mon, length=2, by='-1 day')[2]
>> last.day
>>     
> [1] "2009-09-30 GMT"
>   
>
>
> On Sun, Sep 13, 2009 at 2:18 PM, megh <megh700004 at yahoo.com> wrote:
>   
>> Is there any R function to calculate automatically the last day of a
>> particular month? For example "sep2009" should be converted to last day of
>> September of 2009?
>>
>> Thanks
>> --
>> View this message in context: http://www.nabble.com/How-to-get-last-day-of-a-month--tp25425645p25425645.html
>> Sent from the R help mailing list archive at Nabble.com.
>>
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>> and provide commented, minimal, self-contained, reproducible code.
>>
>>     
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