val Date.startOfMonth: Date
The date at the start of the month that this date falls in.
(iosArm64, iosX64, jvm, macosX64, tvosArm64, tvosX64, watchosArm64, watchosX86)val DateTime.startOfMonth: DateTimeval OffsetDateTime.startOfMonth: OffsetDateTimeval ZonedDateTime.startOfMonth: ZonedDateTime
The date-time at the first instant of the month that this date-time falls in.