时间

python datetime处理时间

Python timedelta

import datetime
import time

# datetime.datetime(2015, 1, 1, 20, 23, 20)
# -> '2015-01-01 20:23:20'
def datetime_to_string(dt):
    return dt.strftime("%Y-%m-%d %H:%M:%S")

# '2015-01-01 20:23:20' 
# -> datetime.datetime(2015, 1, 1, 20, 23, 20)
def string_to_datetime(value):
    return datetime.datetime.strptime(value, "%Y-%m-%d %H:%M:%S")

# '2015-01-01 20:23:20'
# -> 1420115000.0
def string_to_timestamp(value):
    return time.mktime(string_to_datetime(value).timetuple())

# 1420115000.0
# -> '2015-01-01 20:23:20'
def timestamp_to_string(value):
    return time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(value))

# datetime.datetime(2016, 12, 8, 9, 20, 30, 229913)
# -> 1481160030.0
def datetime_to_timestamp(value):
    return time.mktime(value.timetuple())
#datetime_to_timestamp(datetime.datetime.today())

# substract_datetime('2016-10-01 10:10:10', '2016-05-01 10:10:10').days
# -153
# 内部只存储days，seconds，microseconds
def substract_datetime(value1, value2):
    dt1 = string_to_datetime(value1)
    dt2 = string_to_datetime(value2)
    return dt2 - dt1

# substract_timestamp('2016-10-01 10:10:10', '2016-05-01 10:10:10')
# -13219200.0
def substract_timestamp(value1, value2):
    ts1 = string_to_timestamp(value1)
    ts2 = string_to_timestamp(value2)
    return ts2 - ts1

# compare_datetime('2016-10-01 10:10:10', '2017-05-01 10:10:10')
# True
def compare_datetime(value1, value2):
    dt1 = string_to_datetime(value1)
    dt2 = string_to_datetime(value2)
    return dt2 > dt1

# datetime_add('2016-10-01 10:10:10', 10)
# datetime.datetime(2016, 10, 11, 10, 10, 10)
def datetime_add(value, days=0, hours=0, minutes=0):
    dt= string_to_datetime(value)
    return dt + datetime.timedelta(days=days, hours=hours, minutes=minutes)

# datetime

# datetime.datetime(2016, 12, 8, 9, 17, 51, 878174)
#datetime.datetime.today()
# datetime.datetime(2016, 12, 8, 9, 17, 31, 845853)
#datetime.datetime.now()