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import calendar
import datetime
from django.utils.html import avoid_wrapping
from django.utils.timezone import is_aware, utc
from django.utils.translation import gettext, ngettext_lazy
TIMESINCE_CHUNKS = (
(60 * 60 * 24 * 365, ngettext_lazy('%d year', '%d years')),
(60 * 60 * 24 * 30, ngettext_lazy('%d month', '%d months')),
(60 * 60 * 24 * 7, ngettext_lazy('%d week', '%d weeks')),
(60 * 60 * 24, ngettext_lazy('%d day', '%d days')),
(60 * 60, ngettext_lazy('%d hour', '%d hours')),
(60, ngettext_lazy('%d minute', '%d minutes'))
)
def timesince(d, now=None, reversed=False):
"""
Take two datetime objects and return the time between d and now as a nicely
formatted string, e.g. "10 minutes". If d occurs after now, return
"0 minutes".
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)
if reversed:
d, now = now, d
delta = now - d
# Deal with leapyears by subtracing the number of leapdays
leapdays = calendar.leapdays(d.year, now.year)
if leapdays != 0:
if calendar.isleap(d.year):
leapdays -= 1
elif calendar.isleap(now.year):
leapdays += 1
delta -= datetime.timedelta(leapdays)
# 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(gettext('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 += gettext(', ') + avoid_wrapping(name2 % count2)
return result
def timeuntil(d, now=None):
"""
Like timesince, but return a string measuring the time until the given time.
"""
return timesince(d, now, reversed=True)