旧暦

1. Origins, structure, and basic meaning

• Structure: 旧暦, read きゅうれき, denotes the traditional lunar calendar, as distinguished from the calendar in ordinary current use.
• Basic usage: It names the calendar used to determine a festival date and traditional observances recalled by a grandmother.

2. Common pitfalls and similar expressions

• A calendar system distinct from the current one
  • Dates and observances follow the older calendar and should not be assumed to match current calendar dates.