[AstroPy] datetime and timestamp

[eperez]

Thank you !!


> El 14 oct 2021, a las 12:02, Evert Rol <evert.rol at gmail.com> escribió:
> 
> That will be due to daylight savings: the difference between the second and third time is 3000 seconds, or 50 minutes, which is 1 hour (daylight savings) - 10 minutes (difference given).
> 
> If you use utctimetuple(), you'll get what you want:
> 
> In [24]: time.mktime(datetime(2021, 3, 28, 3, 00).utctimetuple()) - time.mktime(datetime(2021, 3, 28,  2, 50).utctimetuple())
> Out[24]: 600.0
> 
> 
> An alternative is to use the .timestamp() method of a datetime object, with a specific UTC timezone:
> 
> In [33]: datetime(2021, 3, 28, 3, 00, tzinfo=timezone.utc).timestamp() - datetime(2021, 3, 28, 2, 50, tzinfo=timezone.utc).timestamp()
> Out[33]: 600.0
> 
> 
>> On 14 Oct 2021, at 11:17, eperez <eperez at iaa.es <mailto:eperez at iaa.es>> wrote:
>> 
>> I get an inconsistent result when translating datetime to timestamp:
>> A later date gives a lower timestamp: tehere is a jump backwards:
>> 
>> 
>> In : time.mktime(datetime(2021, 3, 28, 2, 40).timetuple())
>> Out: 1616895600.0
>> 
>> In : time.mktime(datetime(2021, 3, 28, 2, 50).timetuple())
>> Out: 1616896200.0
>> 
>> In : time.mktime(datetime(2021, 3, 28, 3, 0).timetuple())
>> Out: 1616893200.0
>> In : time.mktime(datetime(2021, 3, 28, 3, 10).timetuple())
>> Out: 1616893800.0
>> 
>> 
>> I would very much appreciate your insight.
>> 
>> I am not sure this is the right list to ask; apologies if it isn’t.
>> 
>> Cheers.
>> ES.Enrique
>> 
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