# How to reset indicators in quantstrat / quantmod?

I am currently trying to back test a strategy on a file which contains minutely data for the whole month. I would like to reset my indicators at 3:30 PM . Is there a way I can reset the indicators based on time or any other way ? Following is the code for adding data and SMA indicator to my strategy . Since the data index is time series , I could use 15:30:00 as an event to reset the SMA indicator . The data contains 1 month of minutely data .

nifty <- as.xts(read.zoo("01122016CE8100.csv",
sep =",",