Epoch Time Convert

Overview

Convert Unix epoch timestamps to ISO datetimes and back, in any IANA timezone. The bundled script auto-detects whether an epoch value is in seconds, milliseconds, microseconds, or nanoseconds.

Quick Start

Run the script with one of three subcommands:

# Current time (UTC by default)
python3 scripts/epoch.py now --tz Asia/Shanghai

# Epoch -> ISO datetime (unit auto-detected)
python3 scripts/epoch.py to-human 1718000000 --tz UTC

# Datetime -> epoch seconds
python3 scripts/epoch.py to-epoch "2024-06-10 08:00:00" --tz Asia/Shanghai

Commands

• now [--tz TZ] — print current epoch seconds, epoch millis, and ISO datetime.
• to-human \x3CEPOCH> [--tz TZ] — convert an epoch value to an ISO datetime. Unit is auto-detected by magnitude (s / ms / µs / ns).
• to-epoch "\x3CDATETIME>" [--tz TZ] — convert a datetime string to epoch seconds. Accepts YYYY-MM-DD[ T]HH:MM[:SS] and YYYY-MM-DD.

Notes

• --tz accepts any IANA timezone name (e.g. UTC, Asia/Shanghai, America/New_York). Defaults to UTC.
• Timezone support uses the standard-library zoneinfo (Python 3.9+). On older runtimes, only UTC is available.
• For naive datetime input, the value is interpreted in the supplied --tz, not the machine's local time.