日期工具類

import math

from datetime import datetime, timedelta
class
calendarutils
:"""
日期工具類
"""@staticmethod
defdelta_day
(delta=0)
:"""
:param delta:   偏移量
:return:        0今天, 1昨天, 2前天, -1明天 ...
"""return
(datetime.now(
)+ timedelta(days=delta)
).strftime(
'%y-%m-%d'
)    @staticmethod
defdelta_week
(delta=0)
:"""
:param delta:   偏移量
:return:        0本週, -1上週, 1下週 ...
"""now = datetime.now(
)        week = now.weekday(
)        _from =
(now - timedelta(days=week -
7* delta)
).strftime(
'%y-%m-%d'
)        _to =
(now + timedelta(days=
6- week +
7* delta)
).strftime(
'%y-%m-%d'
)return _from, _to
@staticmethod
defdelta_month
(delta=0)
:"""
:param delta:   偏移量
:return:        0本月, -1上月, 1下月, 下下個月...
"""def_delta_month
(__year, __month, __delta)
:            _month = __month + __delta
if _month <1:
delta_year = math.ceil(
abs(_month)/12
)                delta_year = delta_year if delta_year else
1                __year -= delta_year
_month = delta_year *
12+ __month + __delta
elif _month >12:
delta_year = math.floor(_month /12)
__year += delta_year
_month %=
12return __year, _month
now = datetime.now(
)        _from = datetime(
*_delta_month(now.year, now.month, delta),1
)        _to = datetime(
*_delta_month(_from.year, _from.month,1)
,1)- timedelta(days=1)
return _from.strftime(
'%y-%m-%d'
), _to.strftime(
'%y-%m-%d'
)    @staticmethod
defdelta_year
(delta=0)
:"""
:param delta:   偏移量
:return:        0今年, -1去年, 1明年 ...
"""now = datetime.now(
)        _from = datetime(now.year + delta,1,
1)_to = datetime(_from.year +1,
1,1)
- timedelta(days=1)
return _from.strftime(
'%y-%m-%d'
), _to.strftime(
'%y-%m-%d'
)if __name__ ==
'__main__'
:print
('當前日期: '
, datetime.now())
print
('*'*40
)print
('今天: '
, calendarutils.delta_day())
print
('昨天: '
, calendarutils.delta_day(-1
))print
('前天: '
, calendarutils.delta_day(-2
))print
('明天: '
, calendarutils.delta_day(1)
)print
('後天: '
, calendarutils.delta_day(2)
)print
('*'*40
)print
('本週: '
, calendarutils.delta_week())
print
('上週: '
, calendarutils.delta_week(-1
))print
('下週: '
, calendarutils.delta_week(1)
)print
('*'*40
)print
('本月: '
, calendarutils.delta_month())
print
('上月: '
, calendarutils.delta_month(-1
))print
('下月: '
, calendarutils.delta_month(1)
)print
('*'*40
)print
('本年: '
, calendarutils.delta_year())
print
('去年: '
, calendarutils.delta_year(-1
))print
('明年: '
, calendarutils.delta_year(1)
)

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