weekday

[claudio cortes]

Greetings:

How to obtain the weekday (1-7) having the year,month and day of a certain date.
I probed with strftime but doesn't work
Thank's !


-- 
Claudio Cortes
+56 (2) 2994121

Meteorologo
Laboratorio de Meteorologia y Calidad de Aire
Centro Nacional del Medio Ambiente (CENMA)
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Claudio Cortes
+56 (2) 2994121

Meteorologist
Meteorology and Air Quality Labs
National Enviroment Center, Chile (CENMA)