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from __future__ import unicode_literals
import calendar
import datetime
from django.utils.html import avoid_wrapping
from django.utils.timezone import is_aware, utc
from django.utils.translation import ugettext, ungettext_lazy
TIMESINCE_CHUNKS = (
(60 * 60 * 24 * 365, ungettext_lazy('%d year', '%d years')),
(60 * 60 * 24 * 30, ungettext_lazy('%d month', '%d months')),
(60 * 60 * 24 * 7, ungettext_lazy('%d week', '%d weeks')),
(60 * 60 * 24, ungettext_lazy('%d day', '%d days')),
(60 * 60, ungettext_lazy('%d hour', '%d hours')),
(60, ungettext_lazy('%d minute', '%d minutes'))
)
def timesince(d, now=None, reversed=False):
"""
Takes two datetime objects and returns the time between d and now
as a nicely formatted string, e.g. "10 minutes". If d occurs after now,
then "0 minutes" is returned.
Units used are years, months, weeks, days, hours, and minutes.
Seconds and microseconds are ignored. Up to two adjacent units will be
displayed. For example, "2 weeks, 3 days" and "1 year, 3 months" are
possible outputs, but "2 weeks, 3 hours" and "1 year, 5 days" are not.
Adapted from
http://web.archive.org/web/20060617175230/http://blog.natbat.co.uk/archive/2003/Jun/14/time_since
"""
# Convert datetime.date to datetime.datetime for comparison.
if not isinstance(d, datetime.datetime):
d = datetime.datetime(d.year, d.month, d.day)
if now and not isinstance(now, datetime.datetime):
now = datetime.datetime(now.year, now.month, now.day)
if not now:
now = datetime.datetime.now(utc if is_aware(d) else None)
delta = (d - now) if reversed else (now - d)
# Deal with leapyears by subtracing the number of leapdays
delta -= datetime.timedelta(calendar.leapdays(d.year, now.year))
# ignore microseconds
since = delta.days * 24 * 60 * 60 + delta.seconds
if since <= 0:
# d is in the future compared to now, stop processing.
return avoid_wrapping(ugettext('0 minutes'))
for i, (seconds, name) in enumerate(TIMESINCE_CHUNKS):
count = since // seconds
if count != 0:
break
result = avoid_wrapping(name % count)
if i + 1 < len(TIMESINCE_CHUNKS):
# Now get the second item
seconds2, name2 = TIMESINCE_CHUNKS[i + 1]
count2 = (since - (seconds * count)) // seconds2
if count2 != 0:
result += ugettext(', ') + avoid_wrapping(name2 % count2)
return result
def timeuntil(d, now=None):
"""
Like timesince, but returns a string measuring the time until
the given time.
"""
return timesince(d, now, reversed=True)
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