converting 13-digit unixtime in ms to timestamp in python.

timestamp_to_datetime.py

"""
converting 13-digit unixtime in ms to timestamp in python.
"""

from datetime import datetime

from pydantic import BaseModel, validator


class Timestamp(BaseModel):
    time: int

    @validator('time')
    def check_time(cls, value):
        if len(str(value)) == 13:
                return value
        raise ValueError('timestamp is invalid')


def int_to_datetime(time: int):
    try:
        Timestamp(time=time)
    except ValueError as e:
        return e
    _time = datetime.fromtimestamp(time/1000)
    return _time.strftime('%Y-%m-%d %H:%M:%S.%f')[:-3]


if __name__ == '__main__':
    res = int_to_datetime(1654061396980)
    print(res)