strptime( ) function in [R] to manipulate date/time class

So i'm working with a simple data set wanting to plot day x frequency

the date is given in a human-readable format of

> head(gb.day)
[1] Sep 12, 2011 11:59 PM Sep 12, 2011 11:59 PM Sep 12, 2011 11:58 PM
[4] Sep 12, 2开发者_C百科011 11:56 PM Sep 12, 2011 11:55 PM Sep 12, 2011 11:55 PM
644 Levels: Sep 12, 2011 01:09 PM Sep 12, 2011 01:10 PM ... Sep 12, 2011 11:59 PM

and is read as a factor.

I'm trying to convert it into a date via the strptime( ) function in [R] and am running into problems

> strptime(gb.day,"%b %d %Y %l %p")

I thought would be the correct parameters but is returning NAs Are my parameters correct?

Are there any other suggestions to accomplish this simple hassle

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You can also add the comma in the strptime() format:

R> var <- "Sep 12, 2011 11:59 PM"
R> strptime(var, "%b %d, %Y %I:%M %p")
[1] "2011-09-12 23:59:00"
R> 

Apart from that, your problem may have the use of factor encoding. Also try

R> strptime( as.character(gb.day) ,"%b %d, %Y %I:%M %p")

Lastly, you may have inadvertently swapped a '1' (digit one) or an 'I' (uppercase i).

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from datetime import datetime

start_time = datetime.strptime(datetime.now(), "%Y-%m-%d %H:%M:%S")