python 時間、日期相關代碼實現

# coding=utf-8
'''
獲取當前時間上一週的開始日期和結束日期
獲取當前時間上一月的開始日期和結束日期
'''
import datetime

d = datetime.datetime.now()

def day_get(d):
    oneday = datetime.timedelta(days=1)
    day = d - oneday
    date_from = datetime.datetime(day.year, day.month, day.day, 0, 0, 0)
    date_to = datetime.datetime(day.year, day.month, day.day, 23, 59, 59)
    print ('---'.join([str(date_from), str(date_to)]))

def week_get(d):
    dayscount = datetime.timedelta(days=d.isoweekday())
    dayto = d - dayscount
    sixdays = datetime.timedelta(days=6)
    dayfrom = dayto - sixdays
    date_from = datetime.datetime(dayfrom.year, dayfrom.month, dayfrom.day, 0, 0, 0)
    date_to = datetime.datetime(dayto.year, dayto.month, dayto.day, 23, 59, 59)
    print ('---'.join([str(date_from), str(date_to)]))

def month_get(d):
    """
    返回上個月第一個天和最後一天的日期時間
    :return
    date_from: 2016-01-01 00:00:00
    date_to: 2016-01-31 23:59:59
    """
    dayscount = datetime.timedelta(days=d.day)
    dayto = d - dayscount
    date_from = datetime.datetime(dayto.year, dayto.month, 1, 0, 0, 0)
    date_to = datetime.datetime(dayto.year, dayto.month, dayto.day, 23, 59, 59)
    print ('---'.join([str(date_from), str(date_to)]))
    return date_from, date_to

week_get(d)

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# coding=utf-8
import datetime
from datetime import timedelta


def gen_dates(b_date, days):
    day = timedelta(days=1)
    # print(day)
    for i in range(days):
        # print(b_date + day*i)
        yield b_date + day*i

def get_date_list(start_date, end_date):   #end_date=None
    """
    獲取日期列表
    :param start: 開始日期
    :param end: 結束日期
    :return:
    """
    if start_date is not None:
        start = datetime.datetime.strptime(start_date, "%Y-%m-%d")
    if end_date is None:
        end = datetime.datetime.now()
    else:
        end = datetime.datetime.strptime(end_date, "%Y-%m-%d")
    # print(start, end)
    # print(type((end-start).days))    # <class 'int'>   29   4-01  -->  4-30    29 天
    data = []
    for d in gen_dates(start, ((end-start).days + 1)):    # 29 + 1
        # print(d)   # datetime.datetime  類型
        data.append(d.strftime("%Y-%m-%d"))
    '''
     ['2018-04-01', '2018-04-02', '2018-04-03', '2018-04-04', '2018-04-05', '2018-04-06', '2018-04-07', '2018-04-08',
     '2018-04-09', '2018-04-10', '2018-04-11', '2018-04-12', '2018-04-13', '2018-04-14', '2018-04-15', '2018-04-16',
     '2018-04-17', '2018-04-18', '2018-04-19', '2018-04-20', '2018-04-21', '2018-04-22', '2018-04-23', '2018-04-24',
     '2018-04-25', '2018-04-26', '2018-04-27', '2018-04-28', '2018-04-29', '2018-04-30', '2018-05-01', '2018-05-02',
     '2018-05-03', '2018-05-04', '2018-05-05', '2018-05-06', '2018-05-07', '2018-05-08', '2018-05-09']
    '''
    return data

if __name__ == '__main__':
    '''
    兩個日期之間的所有日期，包括開始日期， 包括 結束日期
    '''
    start_date = '2018-04-01'
    end_date = '2018-04-30'
    print(get_date_list(start_date, end_date))

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# coding=utf-8
import time, datetime

def get_day_nday_ago(date, i):
    # 獲取指定日期前3天的日期
    # print(date)
    t = time.strptime(date, "%Y-%m-%d")
    y, m, d = t[0:3]
    Date = str(datetime.datetime(y, m, d) - datetime.timedelta(i)).split()
    return Date[0]

def day_before_date(day02):
    # days = ['2018-03-18', '2018-03-19', '2018-03-20', '2018-03-21', '2018-03-22', '2018-03-23', '2018-03-24', '2018-03-25', '2018-03-26', '2018-03-27', '2018-03-28', '2018-03-29', '2018-03-30',  '2018-03-31','2018-04-01', '2018-04-02', '2018-04-03', '2018-04-04', '2018-04-05', '2018-04-06', '2018-04-07', '2018-04-08', '2018-04-09', '2018-04-10', '2018-04-11', '2018-04-12', '2018-04-13', '2018-04-14', '2018-04-15', '2018-04-16']
    # print(day)
    # a = datetime.datetime.now()
    # print(a)
    # b = a.strftime('%Y%m%d')
    # print(b)
    # day02 = b[0:4] + '-' + b[4:6] + '-' + b[6:8]
    days_list = []
    for i in range(0, 30):    # (1, 31) 前三十天，不包括指定日期在內      （0， 30）前三十天包括指定日期在內
        date02 = get_day_nday_ago(day02, i)
        days_list.append(date02)
    thirty_before_days = days_list[::-1]
    # print(thirty_before_days)
    print(days_list)
    return thirty_before_days
if __name__ == '__main__':
   # 指定日期前30天的所有日期
    day = '2018-05-07'
    day_before_date(day)

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# coding=utf-8
import calendar

def month_has_days(date):
    monthRange = calendar.monthrange(int(date[0:4]), int(date[4:6]))
    # print(monthRange[1])
    return monthRange[1]
#輸出：
#(5,30)
# 輸出的是一個元組，第一個元素是月份（0-11），第二個元素是這個月的天數。

if __name__ == '__main__':
    # 哪年哪月總共有多少天
    date = '201801'
    month_has_days(date)

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# coding=utf-8
import time

def get_moment():
    print(int(round(time.time())))
    print(type(int(round(time.time()))))   # int
    return int(round(time.time()))

def get_moment_str():
    print(time.strftime("%Y-%m-%d %H:%M:%S"))
    print(type(time.strftime("%Y-%m-%d %H:%M:%S")))    # str
    return time.strftime("%Y-%m-%d %H:%M:%S")

if __name__ == '__main__':
    # 獲取當前時間  時間戳, （10位） 1531881388
    # 獲取當前時間  字符串           2018-07-18 10:36:27
    '''
    默認情況下python的時間戳是以秒爲單位輸出的float
    通過把秒轉換毫秒的方法獲得13位的時間戳：round()是四捨五入。
    '''
    get_moment()
    get_moment_str()

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# coding=utf-8
import time, datetime

def get_day_nday_ago(date, i):
    # 獲取指定日期前3天的日期
    # print(date)
    t = time.strptime(date, "%Y-%m-%d")
    y, m, d = t[0:3]
    Date = str(datetime.datetime(y, m, d) - datetime.timedelta(i)).split()
    return Date[0]

def day_before_date(day02):
    # days = ['2018-03-18', '2018-03-19', '2018-03-20', '2018-03-21', '2018-03-22', '2018-03-23', '2018-03-24', '2018-03-25', '2018-03-26', '2018-03-27', '2018-03-28', '2018-03-29', '2018-03-30',  '2018-03-31','2018-04-01', '2018-04-02', '2018-04-03', '2018-04-04', '2018-04-05', '2018-04-06', '2018-04-07', '2018-04-08', '2018-04-09', '2018-04-10', '2018-04-11', '2018-04-12', '2018-04-13', '2018-04-14', '2018-04-15', '2018-04-16']
    # print(day)
    # a = datetime.datetime.now()
    # print(a)
    # b = a.strftime('%Y%m%d')
    # print(b)
    # day02 = b[0:4] + '-' + b[4:6] + '-' + b[6:8]
    days_list = []
    for i in range(1, 31):    # (1, 31) 前三十天，不包括指定日期在內      （0， 30）前三十天包括指定日期在內
        date02 = get_day_nday_ago(day02, i)
        days_list.append(date02)
    thirty_before_days = days_list[::-1]
    # print(thirty_before_days)
    print(days_list)
    return thirty_before_days

def day_30_ago():
    # 獲取今天日期
    today = time.strftime("%Y:%m:%d").replace(':', '-')
    # print(today)
    # print(type(today))
    day_before_date(today)

if __name__ == '__main__':
   # 指定日期前30天的所有日期
    day_30_ago()