Strategy for ema crossover and crossover should be within 5 previous candles

Algos, strategies, code
1

15 ema crossed 30 ema and crossover has taken place within previous 5 candles

2

For the above query you will get alerts once crossover happens on current close of candle

CROSSOVER(EMA(CLOSE,15),EMA(CLOSE,30))
3

Thanks sir,
ur coding will show only those crossovers which as taken place live or previous day.
But I want crossover should be within 5 previous candles and not older than 5 candles.
Suppose if crossover has taken place on 2nd day of any month , then if we scan on 5th day it should show the all the crossovers which has taken place between 1- 5 days