How many interest accruing days between $3/1/21$ and the date, given the day count convention in each problem?

$1.4/18/21$ with an actual$/$actual conversion

$2.4/18/21$ with a $30/360$ convention?

$3.11/18\mathrm{.}21$ with a $30/360$ convention?

$4.$ If coupons on a bond are semiannually paid on March $1$ and September $1,$ under the $30/360$ convention, how many days are in the reference period between March $1$ to September $1$

$5.$ If coupons on a bond are semiannually paid on March $1$ and September $1,$ under the actual$/$actual convention, how many days are in the reference period between March $1$ to September $1?$