session

Trading session detection and classification. The session namespace provides boolean flags for determining when the current bar falls within different trading session phases or session boundaries (first/last bar of the day). Use these flags to trigger actions at specific times during the trading day.

Quick Example 

from pynecore.lib import close, session, bar_index, label, strategy

@script.indicator(title="Session Detector", overlay=True)
def main():
    # Mark the first bar of each day's session
    if session.isfirstbar_regular:
        label.new(bar_index, close, "Day start", textcolor="color.green")
    
    # Mark the last bar of regular trading hours
    if session.islastbar_regular:
        label.new(bar_index, close, "Regular close", textcolor="color.red")
    
    # Trade only during market hours
    if session.ismarket:
        strategy.entry("Long", strategy.long)

Variables

All session variables are read-only module properties (accessed without parentheses).

isfirstbar_regular

Returns True if the current bar is the first bar of the day’s regular trading session, False otherwise.

Type: bool

Example:

is_first: bool = session.isfirstbar_regular  # True on first regular bar of day

isfirstbar

Returns True if the current bar is the first bar of the trading day, False otherwise. When extended session data is enabled, only returns True for the first bar of pre-market hours.

Type: bool

Note: Extended session support is not yet fully implemented; behaves like isfirstbar_regular.

Example:

is_session_start: bool = session.isfirstbar  # True at session open

islastbar_regular

Returns True if the current bar is the last bar of the day’s regular trading session, False otherwise.

Type: bool

Example:

is_last: bool = session.islastbar_regular  # True on last regular bar of day

islastbar

Returns True if the current bar is the last bar of the trading day, False otherwise. When extended session data is enabled, only returns True for the last bar of post-market hours.

Type: bool

Note: Extended session support is not yet fully implemented; behaves like islastbar_regular.

Example:

is_session_end: bool = session.islastbar  # True at session close

ismarket

Returns True if the current bar is within regular market hours, False otherwise. On daily or longer timeframes, the result depends on whether the bar’s time range overlaps with session hours — typically True for trading days.

Type: bool

Example:

trading_hours: bool = session.ismarket  # True during market hours

ispremarket

Returns True if the current bar is within pre-market hours, False otherwise. Always False on non-intraday charts.

Type: bool

Note: Not yet implemented. Always returns False.

Example:

early_hours: bool = session.ispremarket  # Always False

ispostmarket

Returns True if the current bar is within post-market hours, False otherwise. Always False on non-intraday charts.

Type: bool

Note: Not yet implemented. Always returns False.

Example:

after_hours: bool = session.ispostmarket  # Always False

Constants

NameTypeDescription
session.regularSessionSession type for regular trading hours only (no extended hours).
session.extendedSessionSession type including extended hours (pre-market and post-market).

Compatibility Notes

  • Extended session modes: The session.extended constant is defined but extended session detection is not fully implemented. isfirstbar and islastbar currently behave identically to isfirstbar_regular and islastbar_regular.
  • Pre/post-market detection: ispremarket and ispostmarket are not yet implemented and always return False.
  • Daily+ charts: On daily or longer timeframes, session variables still evaluate using normal session overlap logic. Results depend on whether the bar’s time range overlaps with configured session hours. This may differ from TradingView, which returns False for all session variables on daily+ charts.