[R] Converting dates?

[marcelo]

Dear R-users

I have some doubts about with converting dates...
e.g.
dates         data
23/12/1975    0.8678
03/01/1976    0.8736
28/01/1976    0.765
13/03/1976    0,9654
...
I think that converting these dates can easily my plots...

is there a R function to convert these dates to
a julian dates and so plot that variables??
The help files as.POSIXlt, POSIXt and others
don't aswer my doubts...
DateTimeClass convert my "dates" to a format POSIX
and so i can plot??
Thanks for any help!
-- 
Marcelo Alexandre Bruno - Pos-graduacao Oceanografia Biologica
Departamento de Oceanografia -  Laboratorio de Ecologia do Ictioplancton
(0xx53) 2336529 - Rio Grande - RS - BRAZIL

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