import datetime
from datetime import timedelta
 
now = datetime.datetime.now()
 
# 今天
today = now
print('--- today = {}'.format(today))
 
# 昨天
yesterday = now - timedelta(days=1)
print('--- yesterday = {}'.format(yesterday))
 
# 明天
tomorrow = now + timedelta(days=1)
print('--- tomorrow = {}'.format(tomorrow))
 
 
# 當前季度
now_quarter = now.month / 3 if now.month % 3 == 0 else now.month / 3 + 1
print('--- now_quarter = {}'.format(now_quarter))
 
# 本週第一天和最後一天
this_week_start = now - timedelta(days=now.weekday())
this_week_end = now + timedelta(days=6 - now.weekday())
print('--- this_week_start = {} this_week_end = {}
 
'.format(this_week_start, this_week_end))
 
# 上週第一天和最後一天
last_week_start = now - timedelta(days=now.weekday() + 7)
last_week_end = now - timedelta(days=now.weekday() + 1)
print('--- last_week_start = {} last_week_end = {}'.format(last_week_start, last_week_end))
 
# 本月第一天和最後一天
this_month_start = datetime.datetime(now.year, now.month, 1)
this_month_end 
 
= datetime.datetime(now.year, now.month + 1, 1) - timedelta(days=1)+ datetime.timedelta(
    hours=23, minutes=59, seconds=59)
print('--- this_month_start = {} this_month_end = {}'.format(this_month_start, this_month_end))
 
# 上月第一天和最後一天
last_month_end = this_month_start - timedelta(days=1)+ datetime.timedelta(
    hours=23, minutes=59, seconds=59)
last_month_start = datetime.datetime(last_month_end.year, last_month_end.month, 1)
print('--- last_month_end = {} last_month_start = {}'.format(last_month_end, last_month_start))
 
# 本季第一天和最後一天
month = (now.month - 1) - (now.month - 1) % 3 + 1
this_quarter_start = datetime.datetime(now.year, month, 1)
this_quarter_end = datetime.datetime(now.year, month + 3, 1) - timedelta(days=1)+ datetime.timedelta(
    hours=23, minutes=59, seconds=59)
print('--- this_quarter_start = {} this_quarter_end = {}'.format(this_quarter_start, this_quarter_end))
 
# 上季第一天和最後一天
last_quarter_end = this_quarter_start - timedelta(days=1)+ datetime.timedelta(
    hours=23, minutes=59, seconds=59)
last_quarter_start = datetime.datetime(last_quarter_end.year, last_quarter_end.month - 2, 1)
print('--- last_quarter_start = {} last_quarter_end = {}'.format(last_quarter_start, last_quarter_end))
 
# 本年第一天和最後一天
this_year_start = datetime.datetime(now.year, 1, 1)
this_year_end = datetime.datetime(now.year + 1, 1, 1) - timedelta(days=1)+ datetime.timedelta(
    hours=23, minutes=59, seconds=59)
print('--- this_year_start = {} this_year_end = {}'.format(this_year_start, this_year_end))
 
# 去年第一天和最後一天
last_year_end = this_year_start - timedelta(days=1)+ datetime.timedelta(
    hours=23, minutes=59, seconds=59)
last_year_start = datetime.datetime(last_year_end.year, 1, 1)
print('--- last_year_start = {} last_year_end = {}'.format(last_year_start, last_year_end))

# 獲取一週的日期
    now_time = datetime.datetime.now()  # 獲取當前時間
    day_num = now_time.isoweekday()  # 當前天是這周的第幾天
    week_start = ((now_time - datetime.timedelta(days=day_num)) + datetime.timedelta(
        days=1)).date()  # 計算當前天所在週週一 格式為yyyy-MM-dd
    week_end = ((now_time - datetime.timedelta(days=day_num)) + datetime.timedelta(
        days=7)).date()  # 計算當前天所在週週天 格式為yyyy-MM-dd
    print(week_end)
    week_e = ((now_time - datetime.timedelta(days=day_num)) + datetime.timedelta(
        days=7))  # 計算當前天所在週週天 格式為yyyy-MM-dd 12:01:13.026315
    week_s = ((now_time - datetime.timedelta(days=day_num)) + datetime.timedelta(
        days=1))  # 計算當前天所在週週一 格式為yyyy-MM-dd 12:01:13.026315
    # while week_s <= week_e:  # 迴圈輸出週一至週五的每天日期格式yyyy-MM-dd
        # print(week_s.date())
    # week_s = week_s + datetime.timedelta(days=1)


    create_time__range = (week_start, week_end)  # 範圍（週一，週五）可用於資料庫日期範圍查詢
    print(create_time__range)