[R] date

[gregory.benmenzer@gazdefrance.com]

hello,

I work with the POSIXlt class and when i write ISOdatetime(1970,1,1,0,0,0),
R returns NA

> ISOdatetime(1970,1,1,0,0,0)
[1] NA

Could you mind me how can i create this date ?

Regards,

Grégory Benmenzer