datetime - Getting warning message 1 failed to parse while running wday fuction of lubridate package in r -

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i trying day name using

wday(ymd("2014/09/30","%y/%m/%d"), label = t)

output getting is

#[1]  3 na #warning message: #1 failed parse.

can please let me know why getting error?

you don't need argument "%y/%m/%d".

just use: 

wday(ymd("2014/09/30"), label = t)

output then:

# [1] tues # levels: sun < mon < tues < wed < thurs < fri < sat

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