datetime to timestamp

[Simen Haugen]

Hi.

How can I convert a python datetime to a timestamp? It's easy to convert
a timestamp to datetime (datetime.datet ime.fromtimesta mp(), but the
other way around...?)

-Simen

[John Machin]

On 11/08/2006 11:10 PM, Simen Haugen wrote:

Hi.

How can I convert a python datetime to a timestamp? It's easy to convert
a timestamp to datetime (datetime.datet ime.fromtimesta mp(), but the
other way around...?)

-Simen

Is the timetuple() method what you want?

#>>import datetime
#>>n = datetime.dateti me.now()
#>>n
datetime.dateti me(2006, 8, 11, 23, 32, 43, 109000)
#>>n.timetuple( )
(2006, 8, 11, 23, 32, 43, 4, 223, -1)

Cheers,
John

[John Machin]

On 11/08/2006 11:35 PM, John Machin wrote:

On 11/08/2006 11:10 PM, Simen Haugen wrote:

>Hi.

How can I convert a python datetime to a timestamp? It's easy to convert
a timestamp to datetime (datetime.datet ime.fromtimesta mp(), but the
other way around...?)

-Simen

Is the timetuple() method what you want?

#>>import datetime
#>>n = datetime.dateti me.now()
#>>n
datetime.dateti me(2006, 8, 11, 23, 32, 43, 109000)
#>>n.timetuple( )
(2006, 8, 11, 23, 32, 43, 4, 223, -1)

Aaaarrrggghhh no it's not what you want -- looks like you have to do the
arithmetic yourself, starting with toordinal()

[Sion Arrowsmith]

John Machin <sj******@lexic on.netwrote:

>On 11/08/2006 11:35 PM, John Machin wrote:

>On 11/08/2006 11:10 PM, Simen Haugen wrote:

>>How can I convert a python datetime to a timestamp? It's easy to convert
a timestamp to datetime (datetime.datet ime.fromtimesta mp(), but the
other way around...?)

Is the timetuple() method what you want?

[ ... ]
Aaaarrrggghh h no it's not what you want -- [ ... ]

It is if you only want it to the second. It just needs a time.mktime():

>>n = time.time()
n

1155307613.4550 381

>>d = datetime.dateti me.fromtimestam p(n)
time.mktime(d .timetuple())

1155307613.0

(timetuple() is responsible for the loss of the fractional part.)

--
\S -- si***@chiark.gr eenend.org.uk -- http://www.chaos.org.uk/~sion/
___ | "Frankly I have no feelings towards penguins one way or the other"
\X/ | -- Arthur C. Clarke
her nu becomeþ se bera eadward ofdun hlæddre heafdes bæce bump bump bump

[Tim Peters]

[Simen Haugen]

>>How can I convert a python datetime to a timestamp? It's easy to convert
a timestamp to datetime (datetime.datet ime.fromtimesta mp(), but the
other way around...?)

[John Machin]

>Is the timetuple() method what you want?

#>>import datetime
#>>n = datetime.dateti me.now()
#>>n
datetime.datet ime(2006, 8, 11, 23, 32, 43, 109000)
#>>n.timetuple ()
(2006, 8, 11, 23, 32, 43, 4, 223, -1)

[also John]

Aaaarrrggghhh no it's not what you want

Yes, it is ;-)

-- looks like you have to do the arithmetic yourself, starting with toordinal()

It's just one step from the time tuple:

import time
time.mktime(som e_datetime_obje ct.timetuple())

The datetime module intended to be an island of relative sanity.
Because the range of dates "timestamps " can represent varies across
platforms (and even "the epoch" varies), datetime doesn't even try to
produce timestamps directly -- datetime is more of an alternative to
"seconds from the epoch" schemes. Because datetime objects have
greater range and precision than timestamps, conversion is
problem-free in only one direction. It's not a coincidence that
that's the only direction datetime supplies ;-)

[John Machin]

Tim Peters wrote:

[Simen Haugen]

>How can I convert a python datetime to a timestamp? It's easy to convert
a timestamp to datetime (datetime.datet ime.fromtimesta mp(), but the
other way around...?)

[John Machin]

Is the timetuple() method what you want?

#>>import datetime
#>>n = datetime.dateti me.now()
#>>n
datetime.dateti me(2006, 8, 11, 23, 32, 43, 109000)
#>>n.timetuple( )
(2006, 8, 11, 23, 32, 43, 4, 223, -1)

[also John]

Aaaarrrggghhh no it's not what you want

Yes, it is ;-)

-- looks like you have to do the arithmetic yourself, starting with toordinal()

It's just one step from the time tuple:

import time
time.mktime(som e_datetime_obje ct.timetuple())

Thanks, Tim. In mitigation, yer honour, I'd like to draw your attention
to the local time (23:32); the defendant was rushing to do the OP's
RTFantasticM for him before retiring for the night, and not doing it
well enough :-)
Cheers,
John