Source Code for Module jdatetime.jalali

  1  #dervied from http://farsitools.sf.net 
  2  #Copyright (C) 2003-2011  Parspooyesh Fanavar (http://parspooyesh.com/) 
  3  #see LICENSE.txt 
  4  g_days_in_month = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31] 
  5  j_days_in_month = [31, 31, 31, 31, 31, 31, 30, 30, 30, 30, 30, 29] 
  6   
  7   
  8 -class GregorianToJalali: 
  9   
 10 -    def __init__(self,gyear,gmonth,gday): 
 11          """ 
 12              Convert gregorian date to jalali date 
 13              gmonth: number of month in range 1-12 
 14          """ 
 15          self.gyear=gyear 
 16          self.gmonth=gmonth 
 17          self.gday=gday 
 18          self.__gregorianToJalali() 
 19   
 20 -    def getJalaliList(self): 
 21          return (self.jyear,self.jmonth,self.jday) 
 22       
 23 -    def __gregorianToJalali(self): 
 24          """ 
 25              g_y: gregorian year 
 26              g_m: gregorian month 
 27              g_d: gregorian day 
 28          """ 
 29          global g_days_in_month,j_days_in_month 
 30   
 31          gy = self.gyear-1600 
 32          gm = self.gmonth-1 
 33          gd = self.gday-1 
 34   
 35          g_day_no = 365*gy+(gy+3)/4-(gy+99)/100+(gy+399)/400 
 36   
 37          for i in range(gm): 
 38              g_day_no += g_days_in_month[i] 
 39          if gm>1 and ((gy%4==0 and gy%100!=0) or (gy%400==0)): 
 40              # leap and after Feb  
 41              g_day_no+=1 
 42          g_day_no += gd 
 43   
 44          j_day_no = g_day_no-79 
 45   
 46          j_np = j_day_no / 12053 
 47          j_day_no %= 12053 
 48          jy = 979+33*j_np+4*int(j_day_no/1461) 
 49   
 50          j_day_no %= 1461 
 51   
 52          if j_day_no >= 366: 
 53              jy += (j_day_no-1)/ 365 
 54              j_day_no = (j_day_no-1)%365 
 55      
 56          for i in range(11): 
 57              if not j_day_no >= j_days_in_month[i]: 
 58                  i-=1 
 59                  break 
 60              j_day_no -= j_days_in_month[i] 
 61      
 62          jm = i+2 
 63          jd = j_day_no+1 
 64   
 65   
 66          self.jyear=jy 
 67          self.jmonth=jm  
 68          self.jday=jd 
 69   
 70   
 71   
 72 -class JalaliToGregorian: 
 73 -    def __init__(self,jyear,jmonth,jday): 
 74          """ 
 75              Convert db time stamp (in gregorian date) to jalali date 
 76          """ 
 77          self.jyear=jyear 
 78          self.jmonth=jmonth 
 79          self.jday=jday 
 80          self.__jalaliToGregorian() 
 81       
 82 -    def getGregorianList(self): 
 83          return (self.gyear,self.gmonth,self.gday) 
 84   
 85       
 86 -    def __jalaliToGregorian(self): 
 87          global g_days_in_month,j_days_in_month 
 88          jy = self.jyear-979 
 89          jm = self.jmonth-1 
 90          jd = self.jday-1 
 91   
 92   
 93          j_day_no = 365*jy +int(jy/33)*8 + (jy%33+3)/4 
 94          for i in range(jm): 
 95              j_day_no += j_days_in_month[i] 
 96   
 97          j_day_no += jd 
 98   
 99          g_day_no = j_day_no+79 
100   
101          gy = 1600 + 400*int(g_day_no/ 146097) # 146097 = 365*400 + 400/4 - 400/100 + 400/400  
102          g_day_no = g_day_no % 146097 
103   
104          leap = 1 
105          if g_day_no >= 36525: # 36525 = 365*100 + 100/4  
106              g_day_no-=1 
107              gy += 100*int(g_day_no/ 36524) # 36524 = 365*100 + 100/4 - 100/100  
108              g_day_no = g_day_no % 36524 
109   
110              if g_day_no >= 365: 
111                  g_day_no+=1 
112              else: 
113                  leap = 0 
114      
115   
116          gy += 4*int(g_day_no/1461) # 1461 = 365*4 + 4/4  
117          g_day_no %= 1461 
118   
119          if g_day_no >= 366: 
120              leap = 0 
121              g_day_no-=1 
122              gy += g_day_no/365 
123              g_day_no = g_day_no % 365 
124   
125          i=0 
126          while g_day_no >= g_days_in_month[i] + (i == 1 and leap): 
127              g_day_no -= g_days_in_month[i] + (i == 1 and leap) 
128              i+=1 
129          self.gmonth = i+1 
130          self.gday = g_day_no+1 
131          self.gyear = gy 
132