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.

y =
m =
d =

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

.

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