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Generate an :RFC:`3339`-formatted timestamp from a
:class:`datetime.datetime`.
>>> from datetime import datetime
>>> generate(datetime(2009,1,1,12,59,59,0,pytz.utc))
'2009-01-01T12:59:59Z'
The timestamp will use UTC unless `utc=False` is specified, in which case
it will use the timezone from the :class:`datetime.datetime`'s
:attr:`tzinfo` parameter.
>>> eastern = pytz.timezone('US/Eastern')
>>> dt = eastern.localize(datetime(2009,1,1,12,59,59))
>>> generate(dt)
'2009-01-01T17:59:59Z'
>>> generate(dt, utc=False)
'2009-01-01T12:59:59-05:00'
Unless `accept_naive=True` is specified, the `datetime` must not be naive.
>>> generate(datetime(2009,1,1,12,59,59,0))
Traceback (most recent call last):
...
ValueError: naive datetime and accept_naive is False
>>> generate(datetime(2009,1,1,12,59,59,0), accept_naive=True)
'2009-01-01T12:59:59Z'
If `accept_naive=True` is specified, the `datetime` is assumed to be UTC.
Attempting to generate a local timestamp from a naive datetime will result
in an error.
>>> generate(datetime(2009,1,1,12,59,59,0), accept_naive=True, utc=False)
Traceback (most recent call last):
...
ValueError: cannot generate a local timestamp from a naive datetime
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