The Julian day (jd) is computed from Gregorian day, month and year (d, m, y) as follows: jd = ( 1461 * ( y + 4800 + ( m - 14 ) / 12 ) ) / 4 + ( 367 * ( m - 2 - 12 * ( ( m - 14 ) / 12 ) ) ) / 12 - ( 3 * ( ( y + 4900 + ( m - 14 ) / 12 ) / 100 ) ) / 4 + d - 32075 Converting from the Julian day number to the Gregorian date is performed thus: l = jd + 68569 n = ( 4 * l ) / 146097 l = l - ( 146097 * n + 3 ) / 4 i = ( 4000 * ( l + 1 ) ) / 1461001 l = l - ( 1461 * i ) / 4 + 31 j = ( 80 * l ) / 2447 d = l - ( 2447 * j ) / 80 l = j / 11 m = j + 2 - ( 12 * l ) y = 100 * ( n - 49 ) + i + l
jd = ( 1461 * ( y + 4800 + ( m - 14 ) / 12 ) ) / 4 +
( 367 * ( m - 2 - 12 * ( ( m - 14 ) / 12 ) ) ) / 12 -
( 3 * ( ( y + 4900 + ( m - 14 ) / 12 ) / 100 ) ) / 4 +
d - 32075
Converting from the Julian day number to the Gregorian date is performed thus:
l = jd + 68569
n = ( 4 * l ) / 146097
l = l - ( 146097 * n + 3 ) / 4
i = ( 4000 * ( l + 1 ) ) / 1461001
l = l - ( 1461 * i ) / 4 + 31
j = ( 80 * l ) / 2447
d = l - ( 2447 * j ) / 80
l = j / 11
m = j + 2 - ( 12 * l )
y = 100 * ( n - 49 ) + i + l