First X Hours Daily High/Low (Auto-DST, Midline & Labels)

How it works

Default: marks the high/low of the first 8 hours of each day starting at 00:00 local + offset.

Adjust dayStartHour (default 0 → midnight) and tzOffsetHrs (default +1 → UTC+1) as needed.

Lines extend across the day unless you toggle off extendRight.