d1

    A number specifying the day of the month

 d2

    A number specifying the month of the year

 d3

    A number specifying the year (either four digits or the last two
    digits of the year)

 t1

    A number specifying the hour of the day

 t2

    A number specifying minutes past the hour

 t3

    A number specifying seconds past the minute

    If you precede any of these values with a plus sign (+) or a
    minus sign (-), you will change the corresponding current value
    by adding to or subtracting from it the value following the + or
    -.