使用之前import：
import time,datetime
下面的函數在python2.7裏可以正常運行，但python2.4可能不支持某些方法。比如python2.4.3中報錯：
AttributeError: type object 'datetime.datetime' has no attribute 'strptime'
格式化當前時間則爲：
首選：time.strftime('%Y-%m-%d %H:%M:%S')
其次：datetime.datetime.strftime(datetime.d atetime.now(), '%Y-%m-%d %H:%M:%S')
最後：str(datetime.datetime.now())[:19]
獲取日期差：
oneday = datetime.timedelta(days=1)
today = datetime.date.today()
yesterday = datetime.date.today() - oneday
tomorrow = datetime.date.today() + oneday
獲取今天零點的時間：
today_zero_time = datetime.datetime.strftime(today, '%Y-%m-%d %H:%M:%S')
print today_zero_time
2013-05-21 00:00:00
獲取時間差：
oneday = datetime.timedelta(days=1)
today_time = datetime.datetime.now()
yesterday_time = datetime.datetime.now() - oneday
tomorrow_time = datetime.datetime.now() + oneday
注意時間是浮點數，帶毫秒。如下：
print tomorrow_time
2013-05-22 10:34:43.873844
那麼要獲取當前時間，需要格式化一下：
oneday = datetime.timedelta(days=1)
today_time = datetime.datetime.now()
yesterday_time = datetime.datetime.now() - oneday
tomorrow_time = datetime.datetime.now() + oneday
tomorrow_time = datetime.datetime.strftime(today_time, '%Y-%m-%d %H:%M:%S')
運行結果如下所示：
print tomorrow_time
2013-05-21 10:34:43
獲取上個月最後一天：
last_month_last_day = datetime.date(datetime.date.today().year,datetime.date.today().month,1)-datetime.timedelta(1)
字符串格式轉秒數：
expire_time = "2013-05-21 09:50:35"
d = datetime.datetime.strptime(expire_time,"%Y-%m-%d %H:%M:%S")
time_sec_float = time.mktime(d.timetuple())
print time_sec_float
1369101035.0
注意python裏獲取到的是float類型的秒數，而不是整形。如果要獲得整數，可以用int(time_sec_float)
秒數轉字符串：
time_sec = time.time()
time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(time_sec))
python的時間轉換函數搞得太抽象複雜，因此我包裝了一個函數，傳入字符串可以獲取到時間的各種格式，傳入秒數可以獲取字符串格式時間（這個是很簡單的），還傳入兩個字符串格式的時間，以計算他們的時間差。
- #coding=gbk
- import time, datetime
- # 傳入一個字符串格式的時間2013-05-21 14:31:23，可以得到各種格式的時間
- class TIMEFORMAT:
- def __init__(self, time_string="1970-1-1 00:00:00"):
- self.time_string = self._format_time_string(time_string)
- def _format_time_string(self, time_string):
- return time.strftime("%Y-%m-%d %H:%M:%S", self.get_struct(time_string))
- @property
- def time_struct(self):
- return self.get_struct(self.time_string)
- def get_struct(self, time_string):
- return time.localtime(self.get_seconds(time_string))
- @property
- def seconds(self):
- return self.get_seconds(self.time_string)
- def get_seconds(self, time_string):
- d = datetime.datetime.strptime(time_string, "%Y-%m-%d %H:%M:%S")
- return time.mktime(d.timetuple())
- def get_string(self, time_sec):
- return time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(time_sec))
- # 對於中國的時間，是1970-01-01 08:00:00
- def check_diff_time(self, t1, t2):
- sec1 = int(self.get_seconds(t1))
- sec2 = int(self.get_seconds(t2))
- if sec1 > sec2:
- secdiff = sec1 - sec2
- else:
- secdiff = sec2 - sec1
- d = self.get_struct(self.get_string(secdiff))
- day = d.tm_mday
- hour = d.tm_hour
- if d.tm_hour < 8:
- day -= 1
- hour = 24 + (d.tm_hour - 8)
- else:
- hour = d.tm_hour - 8
- return {
- "year" :d.tm_year - 1970,
- "month" :d.tm_mon - 1,
- "day" : day - 1,
- "hour" : hour,
- "min" : d.tm_min,
- "sec" : d.tm_sec,
- }
- if __name__ == "__main__":
- t1 = TIMEFORMAT("2015-04-01 12:23:23")
- t2 = TIMEFORMAT("2014-03-10 22:23:23")
- print t1.seconds
- print t2.seconds
- d = t1.check_diff_time(t1.time_string, t2.time_string)
- print "%s 和 %s 時間差爲：%s年%s月%s天%s小時%s分%s秒" %(t1.time_string, t2.time_string, d["year"], d["month"], d["day"], d["hour"], d["min"], d["sec"])