timedalte 是datetime中的一个对象,该对象表示两个时间的差值
构造函数:datetime.timedelta(days=0, seconds=0, microseconds=0, milliseconds=0, minutes=0, hours=0, weeks=0)其中参数都是可选,默认值为0
其中:
1 millisecond = 1000 microseconds1 minute = 60 seconds
1 hour = 3600 seconds
1 week = 7 days
在构造函数中,注意参数值的范围:
0 <= microseconds < 10000000 <= seconds < 3600*24 (the number of seconds in one day)
-999999999 <= days <= 999999999
timedalte 有三个只读属性:
timedelta.min:负数最大时间差,相当于 timedelta(-999999999)。timedelta.max:正数最大时间差,相当于 timedelta(days=999999999, hours=23, minutes=59, seconds=59, microseconds=999999)。
timedelta.resolution:两个时间的最小差值 相当于 timedelta(microseconds=1)。
用法:
data_els = []
today_ele =datetime.now().date()
data_els.append(['今天', datetime.now().date()])
data_els.append(['昨天', today_ele - timedelta(days=1)])
data_els.append(['近7天', today_ele - timedelta(days=7)])
data_els.append(['近30天', today_ele - timedelta(days=7)])
selected = " "
for item in data_els:
option_ele = """<option value="%s" %s>%s</option> """ % (item[1], selected, item[0])
select_ele += option_ele