Date::Today Not Defined

NameError: name 'datetime' is not defined

You need to import the module datetime first:

>>> import datetime

After that it works:

>>> import datetime
>>> date = datetime.date.today()
>>> date
datetime.date(2013, 11, 12)

Date::today not defined?

The Date class you are seeing is defined in lib/rubygems/specification.rb for compatibility reasons:

# date.rb can't be loaded for `make install` due to miniruby
# Date is needed for old gems that stored #date as Date instead of Time.
class Date; end

It's an empty class definition and it doesn't provide any methods or functionality.

If starting IRB without RubyGems, that Date class is gone:

$ ruby --disable-gems -S irb
irb(main):001:0> Date
NameError: uninitialized constant Date

Update

The empty Date class was removed in RubyGems 2.4.0:

• RubyGems no longer defines an empty Date class. Pull Request #948 by Benoit
  Daloze.

NameError: name 'datetime' is not defined [while running 'ChangeDataType DistrictAllocationAndListStore-ptransform-570']

You can try to put import datetime within the function.

Trying to mock datetime.date.today(), but not working

There are a few problems.

First of all, the way you're using mock.patch isn't quite right. When used as a decorator, it replaces the given function/class (in this case, datetime.date.today) with a Mock object only within the decorated function. So, only within your today() will datetime.date.today be a different function, which doesn't appear to be what you want.

What you really want seems to be more like this:

@mock.patch('datetime.date.today')
def test():
    datetime.date.today.return_value = date(2010, 1, 1)
    print datetime.date.today()

Unfortunately, this won't work:

>>> test()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "build/bdist.macosx-10.6-universal/egg/mock.py", line 557, in patched
  File "build/bdist.macosx-10.6-universal/egg/mock.py", line 620, in __enter__
TypeError: can't set attributes of built-in/extension type 'datetime.date'

This fails because Python built-in types are immutable - see this answer for more details.

In this case, I would subclass datetime.date myself and create the right function:

import datetime
class NewDate(datetime.date):
    @classmethod
    def today(cls):
        return cls(2010, 1, 1)
datetime.date = NewDate

And now you could do:

>>> datetime.date.today()
NewDate(2010, 1, 1)

date.getDate is not a function Typescript

I once had a similar problem when getting dates from a web API. I solved it by creating a new Date object.

So your function call could look like this:

this.addDays(new Date(this.gDetailDS.activeFrom),this.gDetailDS.activeNoDays)

Uncaught ReferenceError: $ is not defined when td is defined

It was a DOM issue - on my calendar.php page at the very top, I had:

<?php
include "assets/system/functions.php";
$currentCal = new Calendar("Current");
$nextCal = new Calendar("Next");
$priorCal = new Calendar("Prior");
$wipCal = new Calendar("WIP");
?>

WAY before any of the DOM were created.

I moved it to the bottom of the page and it works just perfect.

Evaluation error: & not defined for Date objects

In the comments to the question camille (user:5325862) suggested to use case_when instead of nasted if statements. The following solution worked for me:

shipments_sample %>% 
  mutate(
    # flights %>% filter(between(month, 7, 9))
    DaysInMonth = case_when(
      StartDate >= floor_date(proratamonth,"month") & StartDate < ceiling_date(proratamonth,"month") ~ as.numeric(ceiling_date(proratamonth,"month") - StartDate),
      EndDate >= floor_date(proratamonth,"month") & EndDate < ceiling_date(proratamonth,"month") ~ as.numeric(ceiling_date(EndDate,"day") - floor_date(proratamonth,"month")),
      StartDate < floor_date(proratamonth,"month") & EndDate >ceiling_date(proratamonth,"month") ~ as.numeric(ceiling_date(proratamonth,"month") - floor_date(proratamonth,"month")),
      TRUE ~ as.numeric(0)
    ),
    Duration = as.numeric(EndDate - StartDate),
    PercentageInMonth = DaysInMonth/as.numeric(EndDate - StartDate),
    ProRata_Rev_Freight = Rev_Freight * PercentageInMonth,
    ProRata_Rev_Demurrage = PercentageInMonth * Rev_Demurrage,
    ProRata_Cost_Transport = PercentageInMonth * Cost_Transport
  )

Python Django NameError: name 'datetime' is not defined

The problem is that you did not imported the datetime module (or at least not in a qualified way): you imported the date attribute.

Use the date class

You can replace datetime.date with just date (and this is the only element you need):

from django.db import models
from django.utils import timezone
from datetime import date
class Item(models.Model):

    FREEZER_DRAWERS = (
            (1, 'Kitchen: Top tray'),
            (2, 'Kitchen: Middle drawer'),
            (3, 'Kitchen: Bottom drawer'),
            )

    TYPES = (
            (1, 'Raw meat'),
            (2, 'Fruit and veg'),
            (3, 'Meal'),
            )

    author = models.ForeignKey('auth.User', on_delete=models.CASCADE)
    title = models.CharField("food", max_length=100)
    item_type = models.IntegerField(choices = TYPES, default = 1)
    added_date = models.DateField("date added", default=date.today)
    where = models.IntegerField(choices = FREEZER_DRAWERS, default = 1)
    expires_date = models.DateField(default = date.today)
    on_shopping_list = models.BooleanField()

    def __str__(self):
        return self.title

Perform an import of the module

Alternatively, you can import the module, and then use datetime.date:

from django.db import models
from django.utils import timezone
import datetime
class Item(models.Model):

    FREEZER_DRAWERS = (
            (1, 'Kitchen: Top tray'),
            (2, 'Kitchen: Middle drawer'),
            (3, 'Kitchen: Bottom drawer'),
            )

    TYPES = (
            (1, 'Raw meat'),
            (2, 'Fruit and veg'),
            (3, 'Meal'),
            )

    author = models.ForeignKey('auth.User', on_delete=models.CASCADE)
    title = models.CharField("food", max_length=100)
    item_type = models.IntegerField(choices = TYPES, default = 1)
    added_date = models.DateField("date added", default=datetime.date.today)
    where = models.IntegerField(choices = FREEZER_DRAWERS, default = 1)
    expires_date = models.DateField(default = datetime.date.today)
    on_shopping_list = models.BooleanField()

    def __str__(self):
        return self.title

Use auto_now_add of the DateField

Regardless how we import this, in fact Django has already support for such default: with auto_now_add=True [Django-doc]: this will add a default value that is equal to today. Furthermore it will make the field blank=True, and editable=False, to prevent it to show up in forms, etc. So it is not completely equivalent, although it is likely what you mean:

# Note: makes the fields blank=True, and editable=False as well.

from django.db import models
from django.utils import timezone

class Item(models.Model):

    FREEZER_DRAWERS = (
            (1, 'Kitchen: Top tray'),
            (2, 'Kitchen: Middle drawer'),
            (3, 'Kitchen: Bottom drawer'),
            )

    TYPES = (
            (1, 'Raw meat'),
            (2, 'Fruit and veg'),
            (3, 'Meal'),
            )

    author = models.ForeignKey('auth.User', on_delete=models.CASCADE)
    title = models.CharField("food", max_length=100)
    item_type = models.IntegerField(choices = TYPES, default = 1)
    added_date = models.DateField("date added", auto_now_add=True)
    where = models.IntegerField(choices = FREEZER_DRAWERS, default = 1)
    expires_date = models.DateField(auto_now_add=True)
    on_shopping_list = models.BooleanField()

    def __str__(self):
        return self.title

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