converter.py

# Gregorian & Jalali ( Hijri_Shamsi , Solar ) Date Converter  Functions
# Author: JDF.SCR.IR =>> Download Full Version :  http://jdf.scr.ir/jdf
# License: GNU/LGPL _ Open Source & Free :: Version: 2.80 : [2020=1399]
# ---------------------------------------------------------------------
# 355746=361590-5844 & 361590=(30*33*365)+(30*8) & 5844=(16*365)+(16/4)
# 355666=355746-79-1 & 355668=355746-79+1 &  1595=605+990 &  605=621-16
# 990=30*33 & 12053=(365*33)+(32/4) & 36524=(365*100)+(100/4)-(100/100)
# 1461=(365*4)+(4/4)   &   146097=(365*400)+(400/4)-(400/100)+(400/400)


def gregorian_to_jalali(gy, gm, gd):
 g_d_m = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334]
 if (gm > 2):
  gy2 = gy + 1
 else:
  gy2 = gy
 days = 355666 + (365 * gy) + ((gy2 + 3) // 4) - ((gy2 + 99) // 100) + ((gy2 + 399) // 400) + gd + g_d_m[gm - 1]
 jy = -1595 + (33 * (days // 12053))
 days %= 12053
 jy += 4 * (days // 1461)
 days %= 1461
 if (days > 365):
  jy += (days - 1) // 365
  days = (days - 1) % 365
 if (days < 186):
  jm = 1 + (days // 31)
  jd = 1 + (days % 31)
 else:
  jm = 7 + ((days - 186) // 30)
  jd = 1 + ((days - 186) % 30)
 return [jy, jm, jd]


def jalali_to_gregorian(jy, jm, jd):
 jy += 1595
 days = -355668 + (365 * jy) + ((jy // 33) * 8) + (((jy % 33) + 3) // 4) + jd
 if (jm < 7):
  days += (jm - 1) * 31
 else:
  days += ((jm - 7) * 30) + 186
 gy = 400 * (days // 146097)
 days %= 146097
 if (days > 36524):
  days -= 1
  gy += 100 * (days // 36524)
  days %= 36524
  if (days >= 365):
   days += 1
 gy += 4 * (days // 1461)
 days %= 1461
 if (days > 365):
  gy += ((days - 1) // 365)
  days = (days - 1) % 365
 gd = days + 1
 if ((gy % 4 == 0 and gy % 100 != 0) or (gy % 400 == 0)):
  kab = 29
 else:
  kab = 28
 sal_a = [0, 31, kab, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
 gm = 0
 while (gm < 13 and gd > sal_a[gm]):
  gd -= sal_a[gm]
  gm += 1
 return [gy, gm, gd]