php - Compare MySQL dates when stored as datetime -

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i have tried several mysql queries compare column of dates stored datetime. need create several different queries depending on action taken on form. below example of sql have created:

create or replace view franchise_filter select * `c_data`.`franchise_leads`    `lead_added` between unix_timestamp(date_sub(now(),interval 3 months)) , unix_timestamp(now())

or

create or replace view franchise_filter select * `c_data`.`franchise_leads` `lead_added` <= 2012-06-27 00:00:00

in second example date supplied php using:

date("y-m-d 00:00:00", strtotime($date_now, "+6 months"))

any appreciated.

you close: use

... `lead_added` <= "2012-06-27 00:00:00"

(mind quotes) and

... `lead_added` between date_sub(now(),interval 3 month) , now()

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