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Note about timestamp() float precision. #30

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Merged
merged 3 commits into from
Jan 16, 2025
Merged

Note about timestamp() float precision. #30

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b2ee818
note about timestamp() float precision.
FoamyGuy Jan 15, 2025
bd7f6eb
format docstring
FoamyGuy Jan 15, 2025
285cdda
Update adafruit_datetime.py
ladyada Jan 16, 2025
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9 changes: 8 additions & 1 deletion adafruit_datetime.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1520,7 +1520,14 @@ def toordinal(self) -> int:
return _ymd2ord(self._year, self._month, self._day)

def timestamp(self) -> float:
"Return POSIX timestamp as float"
"""Return POSIX timestamp as float.

Note that Floats on most boards are encoded in 30 bits
internally, with effectively 22 bits of precision. As a result,
for modern dates this value can be off by several minutes.
As a workaround you can access the function ``_mitime()``
to get an int version of the timestamp.
"""
if not self._tzinfo is None:
return (self - _EPOCH).total_seconds()
s = self._mktime()
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