`bars_back` and `timeframe_bars_back` demo

//version=6
indicator("`bars_back` and `timeframe_bars_back` demo")

//variable The number of bars back on the script's main timeframe (chart timeframe).
int barsBackInput = input.int(10, "Chart bar offset")
//variable The number of bars back on the "1M" timeframe.
int tfBarsBackInput = input.int(3, "'1M' bar offset")

//variable The opening UNIX timestamp of the current "1M" bar.
int monthTime = time("1M")
//variable The opening time of the "1M" bar that contains the bar from `barsBackInput` bars back on the main timeframe.
int offsetTime1 = time("1M", bars_back = barsBackInput)
//variable The "1M" opening time that is `tfBarsBackInput` monthly bars back, relative to the "1M" bar that opens at `offsetTime1`.
// This `time()` call first determines the "1M" bar time corresponding to `barsBackInput` bars back on the
// main timeframe, just like the previous call. Then, it calculates and returns the "1M" opening time that is
// `tfBarsBackInput` *monthly* bars back relative to that time.
int offsetTime2 = time("1M", bars_back = barsBackInput, timeframe_bars_back = tfBarsBackInput)

// Plot the values for visual comparison.
plot(monthTime, "No offset")
plot(offsetTime1, "`bars_back`", color.red)
plot(offsetTime2, "`bars_back` + `timeframe_bars_back`", color.purple)
// Log formatted timestamps in the Pine Logs pane.
log.info("\n{0}\n{1}\n{2}", str.format_time(monthTime), str.format_time(offsetTime1), str.format_time(offsetTime2))