highlighting a row based on cell value

[Castarmax]

Column A is all random dates . When the date happens on the 1st I need to highlight that row. I'm pretty sure conditional formatting is the way I need to go but have had no luck. The date format is dd/mm/yy.

[martindwilson]

conditional format
formula is
=DAY($A1)=1

[nawas]

its cool... thanks a lot

[Castarmax]

Works great Thanks.
Can I expand that to only highlight columns say A-J?

[martindwilson]

select cells columns a to j then apply the format to the lot
best if you only go down as far as rows you think you'll need otherwise you will applying it to 1000000 or so rows!