python中datetime模块的使用

python中datetime模块的使用方法

导入包 import datetime

获取当天日期 now_time=datetime.datetime.now()

print((now_time+datetime.timedelta(days=+1)).strftime("%Y-%m-%d %H:%M:%S")) #获取后一天+1  前一天-1

print ((now_time+datetime.timedelta(hours=-1)).strftime("%Y-%m-%d %H:%M:%S")) #获取前一小时

print(now_time.strftime("%Y-%m-%d %H:%M:%S"),(now_time+datetime.timedelta(minutes=+1)).strftime("%Y-%m-%d %H:%M:%S"))   #前一分钟后一分钟

print(now_time.strftime("%Y-%m-%d %H:%M:%S"),(now_time+datetime.timedelta(minutes=+1/60)).strftime("%Y-%m-%d %H:%M:%S"))#前一秒后一秒

# 导入包
import calendar
import datetime

#获取一个月或是N个月，一年中的天数
years = [2019,]
months = range(1, 13)

for year in years:
    for month in months:
        days = calendar.monthrange(int(year), int(month))[1]
        for day in range(1,(days)+1):
            format_datetime = datetime.datetime(year, month, day).strftime('%Y-%m-%d')
            print(format_datetime)

import calendar
import datetime


years = [2019,]
months = range(1, 13)

for year in settings.years:
   for month in settings.months:
       day = calendar.monthrange(int(year), int(month))[1]
       fromdate = datetime.date(year, month, 1)  # 开始时间： 2019-01-01
       todate = fromdate + datetime.timedelta(days=day + 1)  # 结束时间： 2019-02-02