|Spoiler Inside: Solution to Puzzle||SelectShow>|
Let the first year digit (from the left) be Y1, the second Y2, etc. and similarly for month (M), day (D), hour (h), and minute (m).
YY can not be 0? as M1 must be 1, M2 must be 2, and h1 has no possible value.
YY can not be 1? as M1 must be 0, h1 must be 2, h2 must 3, and D1 has no possible value.
YY can not be 2? as M1 and h1 must be 0 and 1 in some order, D1 must be 3, and D2 has no possible value.
YY can not be 3? as M1, D1, and h2 must be 0, 1, and 2 in some order, and h2 has no possible value.
YY can be 4?. Selecting values to make the date and time as early as possible, M1=0, D1=1, h1=2, h2=3, m1=5, Y2=6, M2=7, D2=8, m2=9.
The date and time is 46-07-18 23:59.