Python 2.6 and timezones

[loial]

Does python have an equivalent of the java Timezone object?

I need to be able to get offsets for timezones (only U.S. time zones
at the moment)

 

[Daniel Kluev]

Does python have an equivalent of the java Timezone object?

I need to be able to get offsets for timezones (only U.S. time zones
at the moment)

Depends on what exactly do you want. If you need to convert timezone
name into current offset, you should use [1] or [2].
If you just need to handle known offsets for datetime objects, there
is tzinfo class in datetime module, [3].


[1] http://pypi.python.org/pypi/PosixTimeZone/0.9.4
[2] http://pypi.python.org/pypi/pytz/2011g
[3] http://docs.python.org/library/datetime.html#tzinfo-objects

 

[loial]

Thanks...but being a python newbie I am struggling to understand how
to do this.

How can I use tzinfo to do the equivalent of what I do in Java, which
is :

TimeZone tz1 = TimeZone.getDefault();

long localOffset = tz1.getOffset(date.getTime());

TimeZone tz2 = TimeZone.getTimeZone("EST");

long remoteOffset = tz2.getOffset(date.getTime());

Any help appreciated

Does python have an equivalent of the java Timezone object?

I need to be able to get offsets for timezones (only U.S. time zones
at the moment)

Depends on what exactly do you want. If you need to convert timezone
name into current offset, you should use [1] or [2].
If you just need to handle known offsets for datetime objects, there
is tzinfo class in datetime module, [3].

[1]http://pypi.python.org/pypi/PosixTimeZone/0.9.4
[2]http://pypi.python.org/pypi/pytz/2011g
[3]http://docs.python.org/library/datetime.html#tzinfo-objects

 

[Daniel Kluev]

Thanks...but being a python newbie I am struggling to understand how
to do this.

How can I use tzinfo to do the equivalent of what I do in Java, which
is :

TimeZone tz1 = TimeZone.getDefault();

long localOffset = tz1.getOffset(date.getTime());

TimeZone tz2 = TimeZone.getTimeZone("EST");

long remoteOffset = tz2.getOffset(date.getTime());

time.timezone returns local timezone in seconds and negative sign.
FixedOffset converts it into tzinfo object.
datetime.timedelta(0, 36000)

utcoffset() returns timedelta object as offset. It requires datetime
object as first parameter due to weird API of base tzinfo class, but
it is not used in calculation, and you can pass any other object,
including None instead, like `local_tz.utcoffset(None)`
datetime.timedelta(-1, 68400)

You can add or substract these timedelta objects directly from
datetime objects or use astimezone():
datetime.datetime(2011, 5, 23, 7, 41, 48, 398685, tzinfo=<StaticTzInfo 'EST'>)