What I need to do I have a timezone-unaware datetime object, to which I need to add a time zone in order to be able to compare it with other timezone-aware datetime objects. I do not want to convert my entire application to timezone unaware for this one legacy case. What I've Tried First, to demonstrate the problem: ``` Python 2.6.1 (r261:67515, Jun 24 2010, 21:47:49) [GCC 4.2.1 (Apple Inc. build 5646)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> import datetime >>> import pytz >>> unaware = datetime.datetime(2011,8,15,8,15,12,0) >>> unaware datetime.datetime(2011, 8, 15, 8, 15, 12) >>> aware = datetime.datetime(2011,8,15,8,15,12,0,pytz.UTC) >>> aware datetime.datetime(2011, 8, 15, 8, 15, 12, tzinfo=) >>> aware == unaware Traceback (most recent call last): File "", line 1, in TypeError: can't compare offset-naive and offset-aware datetimes ``` First, I tried `astimezone`: ``` >>> unaware.astimezone(pytz.UTC) Traceback (most recent call last): File "", line 1, in ValueError: astimezone() cannot be applied to a naive datetime >>> ``` It's not terribly surprising this failed, since it's actually trying to do a conversion. Replace seemed like a better choice (as per How do I get a value of datetime.today() in Python that is "timezone aware"?): ``` >>> unaware.replace(tzinfo=pytz.UTC) datetime.datetime(2011, 8, 15, 8, 15, 12, tzinfo=) >>> unaware == aware Traceback (most recent call last): File "", line 1, in TypeError: can't compare offset-naive and offset-aware datetimes >>> ``` But as you can see, replace seems to set the `tzinfo`, but not make the object aware. I'm getting ready to fall back to doctoring the input string to have a timezone before parsing it (I'm using `dateutil` for parsing, if that matters), but that seems incredibly kludgy. Also, I've tried this in both Python 2.6 and Python 2.7, with the same results. Context I am writing a parser for some data files. There is an old format I need to

Is there a nicer way than the following to return today's date in the `YYYY-MM-DD` format? ``` str(datetime.datetime.today()).split()[0] ```

What I need to do I have a timezone-unaware datetime object, to which I need to add a time zone in order to be able to compare it with other timezone-aware datetime objects. I do not want to convert my entire application to timezone unaware for this one legacy case. What I've Tried First, to demonstrate the problem: ``` Python 2.6.1 (r261:67515, Jun 24 2010, 21:47:49) [GCC 4.2.1 (Apple Inc. build 5646)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> import datetime >>> import pytz >>> unaware = datetime.datetime(2011,8,15,8,15,12,0) >>> unaware datetime.datetime(2011, 8, 15, 8, 15, 12) >>> aware = datetime.datetime(2011,8,15,8,15,12,0,pytz.UTC) >>> aware datetime.datetime(2011, 8, 15, 8, 15, 12, tzinfo=) >>> aware == unaware Traceback (most recent call last): File "", line 1, in TypeError: can't compare offset-naive and offset-aware datetimes ``` First, I tried `astimezone`: ``` >>> unaware.astimezone(pytz.UTC) Traceback (most recent call last): File "", line 1, in ValueError: astimezone() cannot be applied to a naive datetime >>> ``` It's not terribly surprising this failed, since it's actually trying to do a conversion. Replace seemed like a better choice (as per How do I get a value of datetime.today() in Python that is "timezone aware"?): ``` >>> unaware.replace(tzinfo=pytz.UTC) datetime.datetime(2011, 8, 15, 8, 15, 12, tzinfo=) >>> unaware == aware Traceback (most recent call last): File "", line 1, in TypeError: can't compare offset-naive and offset-aware datetimes >>> ``` But as you can see, replace seems to set the `tzinfo`, but not make the object aware. I'm getting ready to fall back to doctoring the input string to have a timezone before parsing it (I'm using `dateutil` for parsing, if that matters), but that seems incredibly kludgy. Also, I've tried this in both Python 2.6 and Python 2.7, with the same results. Context I am writing a parser for some data files. There is an old format I need to

Is there a nicer way than the following to return today's date in the `YYYY-MM-DD` format? ``` str(datetime.datetime.today()).split()[0] ```