Try this :
PHP Code:
#include <amxmodx>
new day = 0
public plugin_init()
{
register_plugin("Example :)", "1.0", "gogicaa")
register_event("HLTV", "new_round", "a", "1=0", "2=0")
}
public new_round()
{
day += 1
set_hudmessage(255, 0, 0, -1.0, 0.11, 0, 6.0, 5.0)
show_hudmessage(0, "Today is day %d" , day)
}