Mulling over a search feed that includes date range limits, I had a quick look for a python library that includes “natural language” functions for describing different date ranges. Not finding anything offhand, I popped some quick starter-for-ten functions up at this gist, which should also be embedded below.
It includes things like today(), tomorrow(), last_week(), later_this_month() and so on.
If you know of a “proper” library that does this, please let me know via the comments…
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| import datetime | |
| from dateutil.relativedelta import relativedelta | |
| def today(date=None,iso=False): | |
| if date is None: date=datetime.date.today() | |
| if iso: return date.isoformat() | |
| else: return date | |
| def yesterday(date=None,iso=False): | |
| if date is None: date=today() | |
| yesterday = date.today() – relativedelta(days=1) | |
| if iso: return yesterday.isoformat() | |
| return yesterday | |
| def tomorrow(date=None,iso=False): | |
| if date is None: date=today() | |
| tomorrow=date.today() + relativedelta(days=1) | |
| if iso: return tomorrow.isoformat() | |
| return tomorrow | |
| def last_week(date=None,daterange=True,iso=False): | |
| if date is None: date=today() | |
| start_date = date + relativedelta(days=–date.weekday(), weeks=–1) | |
| end_date = start_date + relativedelta(days=6) | |
| if daterange: | |
| if iso: return start_date.isoformat(),end_date.isoformat() | |
| else: return start_date, end_date | |
| def this_week(date=None,daterange=True,iso=False): | |
| if date is None: date=today() | |
| start_date = date + relativedelta(days=–date.weekday()) | |
| end_date = start_date + relativedelta(days=6) | |
| if daterange: | |
| if iso: | |
| return start_date.isoformat(), end_date.isoformat() | |
| else: | |
| return start_date, end_date | |
| def next_week(date=None,daterange=True,iso=False): | |
| if date is None: date=today() | |
| start_date = date + relativedelta(days=–date.weekday(), weeks=1) | |
| end_date = start_date + relativedelta(days=6) | |
| if daterange: | |
| if iso: | |
| return start_date.isoformat(), end_date.isoformat() | |
| else: | |
| return start_date, end_date | |
| def later_this_week(date=None,incl=False,daterange=True,iso=False): | |
| date=today(date) | |
| start_date, end_date = this_week(date) | |
| if not incl: start_date=tomorrow(date) | |
| else: start_date=today(date) | |
| #Really need to check if today is last day of week? | |
| if daterange: | |
| if iso: | |
| return start_date.isoformat(), end_date.isoformat() | |
| else: | |
| return start_date, end_date | |
| def earlier_this_week(date=None,incl=False,daterange=True,iso=False): | |
| date=today(date) | |
| start_date, end_date = this_week(date) | |
| if not incl: end_date=yesterday(date) | |
| else: end_date=today(date) | |
| #Really need to check if today is first day of week? | |
| if daterange: | |
| if iso: | |
| return start_date.isoformat(), end_date.isoformat() | |
| else: | |
| return start_date, end_date | |
| def last_month(date=None,daterange=True,iso=False): | |
| if date is None: date=today() | |
| end_date = date.replace(day=1)– relativedelta(days=1) | |
| start_date = end_date.replace(day=1) | |
| if daterange: | |
| if iso: return start_date.isoformat(),end_date.isoformat() | |
| else: return start_date, end_date | |
| def next_month(date=None,daterange=True,iso=False): | |
| if date is None: date=today() | |
| end_date = date+ relativedelta(months=2) | |
| end_date=end_date.replace(day=1)– relativedelta(days=1) | |
| start_date = end_date.replace(day=1) | |
| if daterange: | |
| if iso: return start_date.isoformat(),end_date.isoformat() | |
| else: return start_date, end_date | |
| def this_month(date=None,daterange=True,iso=False): | |
| if date is None: date=today() | |
| end_date = next_month(date)[0]– relativedelta(days=1) | |
| start_date = end_date.replace(day=1) | |
| if daterange: | |
| if iso: return start_date.isoformat(),end_date.isoformat() | |
| else: return start_date, end_date | |
| def earlier_this_month(date=None,incl=False,daterange=True,iso=False): | |
| if date is None: date=today() | |
| start_date, end_date = this_month(date) | |
| if not incl: end_date=yesterday(date) | |
| else: end_date=today(date) | |
| #Really need to check if today is first day of month? | |
| if daterange: | |
| if iso: | |
| return start_date.isoformat(), end_date.isoformat() | |
| else: | |
| return start_date, end_date | |
| def later_this_month(date=None,incl=False,daterange=True,iso=False): | |
| if date is None: date=today() | |
| start_date, end_date = this_month(date) | |
| if not incl: start_date=tomorrow(date) | |
| else: start_date=today(date) | |
| #Really need to check if today is last day of month? | |
| if daterange: | |
| if iso: | |
| return start_date.isoformat(), end_date.isoformat() | |
| else: | |
| return start_date, end_date | |
| #via http://stackoverflow.com/a/2384407/454773 | |
| MON, TUE, WED, THU, FRI, SAT, SUN = range(7) | |
| def day_lastweek(day=MON,date=None,iso=False): | |
| if date is None: date=today() | |
| qday= last_week()[0] + relativedelta(days=day) | |
| if iso: return qday.isoformat() | |
| return qday | |
| def day_thisweek(day=MON,date=None,iso=False): | |
| if date is None: date=today() | |
| qday= this_week()[0] + relativedelta(days=day) | |
| if iso: return qday.isoformat() | |
| return qday | |
| def day_nextweek(day=MON,date=None,iso=False): | |
| if date is None: date=today() | |
| qday= next_week()[0] + relativedelta(days=day) | |
| if iso: return qday.isoformat() | |
| return qday |
UPDATE: code repo here: https://github.com/psychemedia/python-natural-time-periods
SEE ALSO: https://github.com/DavidAmison/natural_time
PS more handy fragments:
#http://stackoverflow.com/a/28290050/454773
#Get month and year between two dates
import datetime
from dateutil.rrule import rrule, MONTHLY
strt_dt = datetime.date(2015,4,1)
end_dt = datetime.date(2016,10,1)
dates = ['_'.join([dt.strftime('%B').lower(), dt.strftime('%Y')]) for dt in rrule(MONTHLY, dtstart=strt_dt, until=end_dt)]
OUseful.Info, the blog... 
This is really very useful code. Can you package it as a module? (unless someone points that it already exist)
[[Editor]: package is here: https://github.com/psychemedia/python-natural-time-periods ]