Custom Period High Low

Summary

• I'm moving over from TradeStation and default Pre-Market Session there is 0800-0930. Default PMS on TradingView is 0400-0930. I find that the 0800-0930 High and Low are more accurate levels. This script addresses exactly that - it allows you to grab High and Low of any custom time slot.
  
  
• This script started as Custom Pre-Market H/L, that's why the shading. Then I realized it can be used for any custom time period, so I renamed it to PERIOD H/L.
  
  

Limitations

• Different tickers are provided by different exchanges, in different time zones. The end result is that the SAME session time (0800-0930) may shift for different tickers. Examples:
  - SPY : 0800-0930 // no shift: NYSE, in NYC
  - ES1!: 0900-1030 // shifted 1 hr ahead: CME, in Chicago
  - NQ1!: 0900-1030 // shifted 1 hr ahead: CME, in Chicago
  
  To see for yourself, set Time Zone config parameter to empty string for non-NYC tickers like ES1! or NQ1 and watch times for shaded and non-shaded areas.
  
  
• Why TV chooses to go by the ticker's TZ, and not the TZ that's configured in the lower right corner of my TV screen - I have no idea. But asking for user's TZ is how you fix it.
  
  
• If you know how I can get that value so I don't have to ask the user - let me know. I'm new to TV.
  
  

Hacks

You can use it more than once for, say, Opening Range Breakout. Configure your custom PMS for 0930-0945, change lines, remove area fill - and ta-da - you have High and Low for first 15 min! See release chart for the example.