python 日期操作

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import datetime

# 当前日期 yyyy-mm-dd
print(datetime.date.today())
print(datetime.datetime.now().date())

str = '2019-01-01'
# string --> date
str_date = datetime.datetime.strptime(str,'%Y-%m-%d').date()
print(str_date)
print(type(str_date))

str2 = '2019-01-01 10:25:30'
# string --> datetime
str_date2 = datetime.datetime.strptime(str2,'%Y-%m-%d %H:%M:%S')
print(str_date2)
print(type(str_date2))

# date --> string
str3 = datetime.datetime.strftime(str_date,'%Y-%m-%d')
print(str3)
print(type(str3))

# 日期加减
# 30天之前
print(str_date + datetime.timedelta(days=-30))
print(type(str_date + datetime.timedelta(days=30)))
# 2周之后
print(str_date + datetime.timedelta(weeks=2))
# 16月之后
month_add = 16
print(datetime.datetime(str_date.year + int(month_add/12),str_date.month + month_add - 12,str_date.day))

# 日期比较
print(str_date < datetime.datetime.strptime('2019-03-01','%Y-%m-%d').date())

# 时间差
print(datetime.datetime.strptime('2019-03-01','%Y-%m-%d').date() - str_date )
print(type(datetime.datetime.strptime('2019-03-01','%Y-%m-%d').date() - str_date ))
print((datetime.datetime.strptime('2019-03-01','%Y-%m-%d').date() - str_date ).days)