1.i have viewed the forum and wiki quikly ,but still feel confused about CandlesBefore and CandlesAfter parameters,so is there any concret explanation?maybe a pic to figure out the meanings of these two parameters with different values.

2.i have been using goodTillTime parameters in my strategy and according to this link https://www.dukascopy.com/wiki/#Place_Offer,it seems that i need to set this para as a relative time .but the problem is when i did backtesting,the time got from operating system is not the time of the bar created.so what should i do to modify the code i got from link above?

btw:not like explained in the link above, time to be plused is not in milliseconds,so does a 15 mins bar equals to 15*60*1000 or 15*60*1,000,000 ?

See: https://www.dukascopy.com/client/javadoc/com/dukascopy/api/IHistory.html#getBars(com.dukascopy.api.Instrument,%20com.dukascopy.api.Period,%20com.dukascopy.api.OfferSide,%20com.dukascopy.api.Filter,%20int,%20long,%20int)
For visual example see:
https://www.dukascopy.com/wiki/#Indicator_Calculation/Calculate_indicator_by_candle_interval
Please provide the example strategy and the launch scenario. Describe exactly which values you find to be wrong and what their values should be instead.
1 second is 1000 milliseconds. For convenience consider using TimeUnit.convert.