bivmasti lujvo

x1 is August/the eighth month of year x2 in calendar x3.

Duration. For date, use masnbi. Cf. pavmasti, nanca.

In notes:

cinfyma'i
x1 is August of year x2 in calendar x3.
pavmasti
x1 is January/the first month of year x2 in calendar x3.
bivmast
August.