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Update README.md

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`@@ -1568,6 +1568,17 @@ f_nthDayofweekInMonth(_nth, _dayNo) =>`
`1568`	`1568`	`plotchar(f_nthDayofweekInMonth(i_nth, i_dayNo), "Day", "•", location.top, size = size.tiny)`
`1569`	`1569`	```
`1570`	`1570`
	`1571`	`+### How can I implement a countdown timer?`
	`1572`	`+This code will work at intraday timeframes and at 1D. It would require more discerning logic for it to work on timeframes higher than that:`
	`1573`	`+`
	`1574`	+```js
	`1575`	`+//@version=4`
	`1576`	`+study("Countdown", "", true)`
	`1577`	`+int timeLeftInBar = (timeframe.isdaily and timeframe.multiplier == 1) or timeframe.isintraday ? (time_close - time) - (timenow - time) : 0`
	`1578`	`+string countDown = str.format("{0,time,HH:mm:ss}", timeLeftInBar)`
	`1579`	`+f_print(_text) => var table _t = table.new(position.middle_right, 1, 1), table.cell(_t, 0, 0, _text, bgcolor = color.yellow)`
	`1580`	`+f_print(countDown)`
	`1581`	+```
`1571`	`1582`
`1572`	`1583`	`[Back to top](#table-of-contents)`
`1573`	`1584`

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