python实现时间戳与日期格式互换的函数

import time
'''
时间戳转换成日期格式
1）将时间时间戳转换成时间元组
2）通过strftime(）将时间元组转换成格式化时间
'''
def timestamp_to_format(timestamp=None,format = '%Y-%m-%d %H:%M:%S'):
    # try:
    if timestamp:
        time_tuple = time.localtime(timestamp)
        print('time_tuple:',time_tuple)
        #print('type(time_tuple):',type(time_tuple))
        res = time.strftime(format,time_tuple)
    else:
        res = time.strftime(format)
    return res
    # except:
    #     print('error')

print('时间戳1234567转换成日期格式为：',timestamp_to_format(1234567))

运行结果：

1）time.localtime(seconds=Noe) 作用：将时间戳转换成一个时间元组，包括年，月，天，小时，分钟，秒，当月的第N周，当前年的第M天           如果没有参数传入，那么就转换当前时间的时间戳 def localtime(seconds=None): # real signature unknown; restored from __doc__ """ localtime([seconds]) -> (tm_year,tm_mon,tm_mday,tm_hour,tm_min, tm_sec,tm_wday,tm_yday,tm_isdst) Convert seconds since the Epoch to a time tuple expressing local time. When 'seconds' is not passed in, convert the current time instead. """ pass 函数运行结果： 2）time.strftime(format,p_tuple=None) 作用：根据设定好的格式将时间元组转换成字符串            如果时间元组缺省，那么将当前时间转换成设定格式的日期 def strftime(format, p_tuple=None): # real signature unknown; restored from __doc__ """ strftime(format[, tuple]) -> string Convert a time tuple to a string according to a format specification. See the library reference manual for formatting codes. When the time tuple is not present, current time as returned by localtime() is used. Commonly used format codes: %Y Year with century as a decimal number. %m Month as a decimal number [01,12]. %d Day of the month as a decimal number [01,31]. %H Hour (24-hour clock) as a decimal number [00,23]. %M Minute as a decimal number [00,59]. %S Second as a decimal number [00,61]. %z Time zone offset from UTC. %a Locale's abbreviated weekday name. %A Locale's full weekday name. %b Locale's abbreviated month name. %B Locale's full month name. %c Locale's appropriate date and time representation. %I Hour (12-hour clock) as a decimal number [01,12]. %p Locale's equivalent of either AM or PM. Other codes may be available on your platform. See documentation for the C library strftime function. """ return "" 运行结果：

二：日期格式转换成时间戳

'''
将格式化时间转换为时间戳
1）将日期转换成时间元组
2）转换成时间戳
'''
def timeformat_to_timestamp(timeformat=None,format = '%Y-%m-%d %H:%M:%S'):
    # try:
    if timeformat:
        time_tuple = time.strptime(timeformat,format)
        res = time.mktime(time_tuple) #转成时间戳
    else:
        res = time.time()        #获取当前时间戳
    return int(res)
print("timeformat_to_timestamp('2018-04-12 09:09:45')的时间戳：",timeformat_to_timestamp('2018-04-12 09:09:45'))

运行结果：

时间格式转换成时间戳函数解析

1）time.strptime() 作用：将format格式的时间字符串解析成一个时间元组 def strptime(string, format): # real signature unknown; restored from __doc__ """ strptime(string, format) -> struct_time Parse a string to a time tuple according to a format specification. See the library reference manual for formatting codes (same as strftime()). Commonly used format codes: %Y Year with century as a decimal number. %m Month as a decimal number [01,12]. %d Day of the month as a decimal number [01,31]. %H Hour (24-hour clock) as a decimal number [00,23]. %M Minute as a decimal number [00,59]. %S Second as a decimal number [00,61]. %z Time zone offset from UTC. %a Locale's abbreviated weekday name. %A Locale's full weekday name. %b Locale's abbreviated month name. %B Locale's full month name. %c Locale's appropriate date and time representation. %I Hour (12-hour clock) as a decimal number [01,12]. %p Locale's equivalent of either AM or PM. Other codes may be available on your platform. See documentation for the C library strftime function. """ return struct_time 2）time.mktime(p_tuple) 作用：将时间元组转换成时间戳 def mktime(p_tuple): # real signature unknown; restored from __doc__ """ mktime(tuple) -> floating point number Convert a time tuple in local time to seconds since the Epoch. Note that mktime(gmtime(0)) will not generally return zero for most time zones; instead the returned value will either be equal to that of the timezone or altzone attributes on the time module. """ return 0.0