DaniWeb IT Discussion Community

DaniWeb IT Discussion Community (http://www.daniweb.com/forums/index.php)
-   Python (http://www.daniweb.com/forums/forum114.html)
-   -   Code Snippet: Calendar Arithmetic (Python) (http://www.daniweb.com/forums/thread216493.html)

vegaseat Mar 27th, 2005 1:30 pm
Calendar Arithmetic (Python)
 
The module datetime allows you to call several functions that can do computation with dates and times. How many days since my birth? How many days till Xmas? What's the date 77 days from now? The code snippet should give you a flavor, enough to explore on your own.
 

  1. # testing (or tasting) the module datetime and its method date
  2. # datetime supports calendar arithmetic
  3. # strftime() requires the year to be >=1900
  4. # date() can handle years down to 0001
  5. # Python24 tested   vegaseat  3/27/05
  6.  
  7. import datetime
  8. import calendar
  9.  
  10. today = datetime.date.today()
  11. oneday = datetime.timedelta(days=1)
  12. # loop back to most recent Friday (could be today)
  13. # takes care of end of month and even leap years
  14. friday = today
  15. while friday.weekday() != calendar.FRIDAY:
  16.     friday -= oneday
  17. oneweek = datetime.timedelta(days=7)
  18. nextweek = today + oneweek
  19. nextyear = today.replace(year=today.year+1)
  20. print "Today (year-month-day) =", today
  21. print "Most recent Friday =", friday
  22. print "One week from today =", nextweek
  23. print "One year from today =", nextyear
  24. print "Current time =", datetime.datetime.now().time()  #just the time
  25. print "Lunchtime =", datetime.time(12, 00)              # 12:00:00
  26.  
  27. print '-'*50
  28.  
  29. # a typical birthday year, month, day
  30. # or change it to your own birthday...
  31. birthday = datetime.date(1955, 4, 1)
  32. # three different ways to present a date
  33. # 1955-04-01
  34. print "Birthday format1:", birthday
  35. # 04/01/55
  36. print "Birthday format2:", birthday.strftime("%m/%d/%y")
  37. # 01Apr1955
  38. print "Birthday format3:", birthday.strftime("%d%b%Y")
  39.  
  40. age = today - birthday
  41. print "You are", age.days, "days old today!"
  42.  
  43. # extract the year from todays date
  44. thisyear = int(today.strftime("%Y")[0:4])
  45.  
  46. # party message (include date and time) ...
  47. rightnow = datetime.datetime.today()
  48. bparty = datetime.datetime(thisyear, 4, 1, 14, 30)
  49. # check if you can still make it to the party ...
  50. if bparty > rightnow:
  51.     print "Birthday party", bparty
  52. else:
  53.     print "Missed this year's birthday party!"
  54.  
  55. print '-'*50
  56.  
  57. # calculate days till xmas of this year
  58. xmas = datetime.date(thisyear, 12, 25)
  59. tillXmas = xmas - today
  60. print "There are %d days till xmas!" % tillXmas.days
  61.  
  62. print '-'*50
  63.  
  64. # add days to a given date
  65. delta = datetime.timedelta(days=77)
  66. addDays = today + delta
  67. print "Today's date is               :", today.strftime("%d%b%Y")
  68. print "77 days from today it will be :", addDays.strftime("%d%b%Y")
  69.  
  70. print '-'*50
  71.  
  72. Weekday = ['Monday', 'Tuesday', 'Wednesday', 'Thursday',
  73.   'Friday', 'Saturday', 'Sunday']
  74. print "Today is", Weekday[datetime.date.weekday(today)]
  75. print
  76. print "If you were born on %s you were born on a %s" % (birthday.strftime("%d%b%Y"), Weekday[datetime.date.weekday(birthday)])

All times are GMT -4. The time now is 4:16 pm.

Forum system based on vBulletin Copyright ©2000 - 2009, Jelsoft Enterprises Ltd.
©2003 - 2009 DaniWeb® LLC