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All Periods Converter script converts MT4 1 minute imported historic data to all standard time frames (5m, 15m, 30m, 1h, 4h, 1d) in seconds. Metaquotes provides a PeriodConverter script that requires you do one time period at a time as well as runs continuously if doing custom time periods. The AllPeriodsConverter script simply converts all the standard time periods for when you just install your MT4 or for whatever reason has time period gaps in your hst data. Instructions below.