Add --csv-time-format CLI option

[chanshing]

Add --csv-time-format CLI option

Add CLI option to specify the datetime format for parsing the time column in CSV files.

Usage

# Specify time column format
stepcount data.csv --csv-time-format '%Y-%m-%d %H:%M:%S.%f'

# European date format
stepcount data.csv --csv-time-format '%d/%m/%Y %H:%M:%S'

Files Changed

src/stepcount/stepcount.py

• Add --csv-time-format argument for strptime format string
• Pass parameter to utils.read()

src/stepcount/utils.py

• Add csv_time_format parameter to read()
• When specified, parse time column using pd.to_datetime() with explicit format
• When None, use pandas auto-detection (existing behavior)
• Update warning for non-CSV files to include new option