Start of the simulation. The start date can be determined in several different ways:
A 4-digit year number (f.i. 2006) determines the number of the historical data file with which the simulation starts (f.i. EURUSD_2006.t6). If the file has no year number (f.i. MSFT.t6), the simulation starts with the start of the file.
A date in the 8-digit yyyymmdd format starts the backtest at a certain date (f.i. 20090401 = April 1st, 2009). The simulation period begins earlier because the LookBack period is added in front of the date.
Due to the lookback period, StartDate = 2006 starts the backtest normally at a later date than StartDate = 20060101.
- StartDate = NOW sets the start date to the current day. Useful for strategies that test only a single day.
- StartDate = 0 (default) starts the simulation with the year number given by NumYears before the current year.
End of the simulation, either 4 digits for determining the year number of the last historical price data file (similar to StartDate), or a date in yyyymmdd format for ending the backtest at that date (f.i. 20091231 = December 31, 2009).
If at 0 (default), or if the file has no year number, the
simulation runs until the end of the available price history.
Number of years of the simulation if no StartDate or EndDate is given (default: 6 years). The current year counts as one full year. Set NumYears to -1 for not loading any prices.
Maximum number of bars of the simulation (default: 0 = no limit). The simulation ends either at EndDate or after the given number of bars (including the LookBack period), whichever happens earlier.
Interval in days for automatically downloading new price data and adding it to the price history file (default: 0 = don't download new price data). If the price history is older than the given number of days, the download process starts automatically at the begin of a [Test] or [Train] cycle. Set UpdateDays to -1 for always loading all prices up to the current time.
Interval in days for automatically retraining a live trading system (Zorro S required; default: 0 = no automatic retraining). Set this to the duration of the WFO test period for keeping a WFO trained system in sync with the market.
Maximum allowed gap in days in the historic prices and in the downloaded price data (default: 0 = no gap checking). Set this to 2 or above in order to check the price curve for gaps and inconsistencies, and give an Error 047 message if any are detected. Weekends and international holidays are except from gap checking. Gaps of 1 day are normal in historic prices due to national holidays.
Start of the business week in dhhmm UTC format, where d = day number (1 = Monday .. 7 = Sunday), hh = hour and mm = minute. Default: 72300 (Sunday 23:00 UTC). Used to determine the WeekEnd behavior. If required, set this variable to the local market opening time converted to UTC.
Consider daylight saving (dst function).
End of the business week in dhhmm UTC format. Default: 52000 (Friday 20:00 UTC).
Used to determine the WeekEnd behavior.
If required, set this variable to the local market closing time converted to UTC. Friday 20:00 UTC is equivalent to 15:00 ET without daylight saving and to 16:00 ET with daylight saving.
Daily market opening time in hhmm local time format, hh = hour and mm = minute. Default: 930. Used for the day and market functions.
Daily market closing time in hhmm local time format, hh = hour and mm = minute. Default: 1600. Used for the day and market functions.
Date/time in Windows DATE format for the date/time functions with NOW argument. When at 0 (default), the current PC date and time is used.
- The earliest possible StartDate is determined by the availability of historic price data. M1 data back to 2002 can be downloaded from the Zorro website. In 2002 the EUR replaced national currencies; currency backtests before that date make not much sense as the EUR pairs were not traded in volume and the Forex markets behaved different.
- StartDate and EndDate can be used to 'zoom' the backtest to a certain period and examine the trades of that period in more detail. For the chart, PlotDate and PlotBars can be used for zooming.
- StartDate, EndDate, NumYears and UpdateDays affect price data loading and thus must be set before loading historic prices or calling asset.
- WFO parameters and rules are only valid for the simulation period with which they were created. If the period is changed, the strategy must be trained again.
- When re-training the last WFO cycle, set EndDate to 0, otherwise the training period ends with EndDate.
- The initial run of a strategy (INITRUN) has no valid date since the start and end date are set in this run.
StartDate = 20050901; // start the simulation with September 2005
EndDate = 20050930; // and simulate one month.
bar, BarPeriod, LookBack, Detrend, time/date functions, PlotDate
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