#!python3
import sys, os, datetime

# python3 mtime_iso.py capsule/squat/reports/aarch64_exception_model.gmi
if len(sys.argv) == 2:
    tz = datetime.datetime.now(datetime.timezone.utc).astimezone().tzinfo
    print(datetime.datetime.fromtimestamp(os.stat(sys.argv[1]).st_mtime, tz=tz).astimezone(datetime.timezone.utc).isoformat())
else:
    print(f"Usage: {sys.argv[0]} <path>", file=sys.stderr)
    sys.exit(1)