python 时间操作备忘

1. #!/usr/bin/python
2. '''
3. Filename: "utildate.py"
4. author:   "zhangsong"
5. date  :   "2009-03-24"
6. version:  "1.00"
7. '''
8. from time import strftime, localtime
9. from datetime import timedelta, date
10. import calendar
11.  
12. year = strftime("%Y",localtime())
13. mon  = strftime("%m",localtime())
14. day  = strftime("%d",localtime())
15. hour = strftime("%H",localtime())
16. min  = strftime("%M",localtime())
17. sec  = strftime("%S",localtime())
18.  
19.  
20. def today():
21.     '''
22.     get today,date format="YYYY-MM-DD"
23.     '''
24.     return date.today()
25.  
26. def todaystr():
27.     '''
28.     get date string
29.     date format="YYYYMMDD"
30.     '''
31.     return year+mon+day
32.  
33. def datetime():
34.     '''
35.     get datetime,format="YYYY-MM-DD HH:MM:SS"
36.     '''
37.     return strftime("%Y-%m-%d %H:%M:%S",localtime())
38.  
39. def datetimestr():
40.     '''
41.     get datetime string
42.     date format="YYYYMMDDHHMMSS"
43.     '''
44.     return year+mon+day+hour+min+sec
45.  
46. def getdayofday(n=0):
47.     '''
48.     if n>=0,date is larger than today
49.     if n<0,date is less than today
50.     date format = "YYYY-MM-DD"
51.     '''
52.     if(n<0):
53.         n = abs(n)
54.         return date.today()-timedelta(days=n)
55.     else:
56.         return date.today()+timedelta(days=n)
57.  
58. def getdaysofmonth(year,mon):
59.     '''
60.     get days of month
61.     '''
62.     return calendar.monthrange(year, mon)[1]
63.  
64. def getfirstdayofmonth(year,mon):
65.     '''
66.     get the first day of month
67.     date format = "YYYY-MM-DD"
68.     '''
69.     days="01"
70.     if(int(mon)<10):
71.         mon = "0"+str(int(mon))
72.     arr = (year,mon,days)
73.     return "-".join("%s" %i for i in arr)
74.  
75. def getlastdayofmonth(year,mon):
76.     '''
77.     get the last day of month
78.     date format = "YYYY-MM-DD"
79.     '''
80.     days=calendar.monthrange(year, mon)[1]
81.     mon = addzero(mon)
82.     arr = (year,mon,days)
83.     return "-".join("%s" %i for i in arr)
84.  
85. def get_firstday_month(n=0):
86.     '''
87.     get the first day of month from today
88.     n is how many months
89.     '''
90.     (y,m,d) = getyearandmonth(n)
91.     d = "01"
92.     arr = (y,m,d)
93.     return "-".join("%s" %i for i in arr)
94.  
95. def get_lastday_month(n=0):
96.     '''
97.     get the last day of month from today
98.     n is how many months
99.     '''
100.     return "-".join("%s" %i for i in getyearandmonth(n))
101.   
102. def get_today_month(n=0):
103.     '''
104.     get last or next month's today
105.     n is how many months
106.     date format = "YYYY-MM-DD"
107.     '''
108.     (y,m,d) = getyearandmonth(n)
109.     arr=(y,m,d)
110.     if(int(day)<int(d)):
111.         arr = (y,m,day)
112.     return "-".join("%s" %i for i in arr)
113.  
114. def getyearandmonth(n=0):
115.     '''
116.     get the year,month,days from today
117.     befor or after n months
118.     '''
119.     thisyear = int(year)
120.     thismon = int(mon)
121.     totalmon = thismon+n
122.     if(n>=0):
123.         if(totalmon<=12):
124.             days = str(getdaysofmonth(thisyear,totalmon))
125.             totalmon = addzero(totalmon)
126.             return (year,totalmon,days)
127.         else:
128.             i = totalmon/12
129.             j = totalmon%12
130.             if(j==0):
131.                 i-=1
132.                 j=12
133.             thisyear += i
134.             days = str(getdaysofmonth(thisyear,j))
135.             j = addzero(j)
136.             return (str(thisyear),str(j),days)
137.     else:
138.         if((totalmon>0) and (totalmon<12)):
139.             days = str(getdaysofmonth(thisyear,totalmon))
140.             totalmon = addzero(totalmon)
141.             return (year,totalmon,days)
142.         else:
143.             i = totalmon/12
144.             j = totalmon%12
145.             if(j==0):
146.                 i-=1
147.                 j=12
148.             thisyear +=i
149.             days = str(getdaysofmonth(thisyear,j))
150.             j = addzero(j)
151.             return (str(thisyear),str(j),days)
152.  
153. def addzero(n):
154.     '''
155.     add 0 before 0-9
156.     return 01-09
157.     '''
158.     nabs = abs(int(n))
159.     if(nabs<10):
160.         return "0"+str(nabs)
161.     else:
162.         return nabs
163.  
164. #print today()
165. #print addzero(10)
166. print get_today_month(-1)
167. print get_lastday_month(3)
168. print get_firstday_month(3)