YJ大表哥 当前日期时间
import datetime
print datetime.datetime.now()
# 2018-05-08 16:53:30.101000
格式化时间
import datetime
print datetime.datetime.now().strftime("%Y-%m-%d %H:%M")
# 2018-05-08 16:54
多加一天
import datetime
print (datetime.datetime.now()+datetime.timedelta(days=1)).strftime("%Y-%m-%d %H:%M:%S")
# 2018-05-09 16:56:07
减一天
import datetime
print (datetime.datetime.now()+datetime.timedelta(days=-1)).strftime("%Y-%m-%d %H:%M:%S")
# 2018-05-07 16:56:59
可以把days改为hours minutes，就可以提前XX小时/分钟了。
timedelta([days[, seconds[, microseconds[, milliseconds[, minutes[,
hours[, weeks]]]]]]])
减去一年
import datetime
from dateutil.relativedelta import relativedelta
d = datetime.datetime.strptime('20180131', '%Y%m%d')
print(d) // 2018-01-31 00:00:00
print((d - relativedelta(years=1)).strftime('%Y%m%d')) // 20170131
