import datetime
import time
from decimal import Decimal
from uuid import UUID
utc_timezone = datetime.timezone.utc
[docs]def decimaltimestamp_from_uuid(uuid_arg):
"""
Return a floating point unix timestamp.
:param uuid_arg:
:return: Unix timestamp in seconds, with microsecond precision.
:rtype: float
"""
return decimaltimestamp(timestamp_long_from_uuid(uuid_arg) / 1e7)
[docs]def timestamp_long_from_uuid(uuid_arg):
"""
Returns an integer value representing a unix timestamp in tenths of microseconds.
:param uuid_arg:
:return: Unix timestamp integer in tenths of microseconds.
:rtype: int
"""
if isinstance(uuid_arg, str):
uuid_arg = UUID(uuid_arg)
assert isinstance(uuid_arg, UUID), uuid_arg
uuid_time = uuid_arg.time
return uuid_time - 0x01B21DD213814000
[docs]def decimaltimestamp(t=None):
"""
A UNIX timestamp as a Decimal object (exact number type).
Returns current time when called without args, otherwise
converts given floating point number ``t`` to a Decimal
with 9 decimal places.
:param t: Floating point UNIX timestamp ("seconds since epoch").
:return: A Decimal with 6 decimal places, representing the
given floating point or the value returned by time.time().
"""
t = time.time() if t is None else t
return Decimal('{:.6f}'.format(t))
[docs]def datetime_from_timestamp(t):
"""
Returns naive UTC datetime from decimal UNIX
timestamps such as time.time().
:param t: timestamp, either Decimal or float
:return: datetime.datetime object
"""
return datetime.datetime.utcfromtimestamp(float(t))