Unix timestamp to datetime

Convert a Unix timestamp (seconds since 1970-01-01 UTC) into a formatted 'YYYY-MM-DD HH:MM:SS' string in UTC.

datetime unix-timestamp utc conversion datetime-module

Write a function `unix_to_datetime(ts: int) -> str` that takes a Unix timestamp (the number of seconds elapsed since 1970-01-01 00:00:00 UTC) and returns the corresponding date and time as a string in the format `'YYYY-MM-DD HH:MM:SS'` in UTC.

Use Python's `datetime` module. Do not adjust for timezones; the returned string must always be in UTC.

Example: `unix_to_datetime(0)` should return `'1970-01-01 00:00:00'`.

Constraints

- `0 <= ts <= 9,999,999,999` (up to the year 2286)
- The input will always be a non-negative integer.
- Your solution must not rely on external libraries.

Example

>>> unix_to_datetime(0)
'1970-01-01 00:00:00'
>>> unix_to_datetime(1609459200)
'2021-01-01 00:00:00'
>>> unix_to_datetime(1234567890)
'2009-02-13 23:31:30'

10 points ~15 min

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Hints

Use `datetime.datetime.fromtimestamp(ts, tz=datetime.timezone.utc)` to get a timezone-aware datetime.

Use the `.strftime('%Y-%m-%d %H:%M:%S')` method to format the datetime object.

Remember that the timestamp is in seconds, not milliseconds.

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