Cool new date checking syntax?

[Sternbach-Software]

Maybe it would be a big win for readability in complex date logic if we could write something like if (date == 7 of CHESHVAN) instead of
jewishMonth == JewishDate.CHESHVAN && jewishDayOfMonth == 7
(slightly more declarative vs imperative)? This is possible with kotlin infix functions. It could possibly evolve into a DSL. I am wondering where this train of thought could go.

For example, what would be the most concise way of expressing this?

fun isMashivHaruachRecited(jewishCalendar: JewishCalendar): Boolean = jewishCalendar.isBetween(
    JewishDate(jewishCalendar.jewishYear, JewishDate.TISHREI, 22),
    JewishDate(jewishCalendar.jewishYear, JewishDate.NISSAN, 15)
)

fun JewishCalendar.isBetween(
    startDate: JewishDate,
    endDate: JewishDate
) = this > startDate && this < endDate

Maybe

fun isMashivHaruachRecited(jewishCalendar: JewishCalendar): Boolean = jewishCalendar between 22 of TISHREI and 15 of NISSAN

Or

fun isMashivHaruachRecited(jewishCalendar: JewishCalendar): Boolean = jewishCalendar in 22 of TISHREI..15 of NISSAN //can use `until` instead of range operator

As well, this is a common occurence:
day >= 15 && (day <= 22 || !inIsrael && day <= 23)
A range where one of the bounds depends on a variable. Maybe we can do better than an if (day in 15..(if(!inIsrael) 23 else 22))?

Maybe something like day in 15..(22.israel ?: 23)