Senin

Senin is the Indonesian and Malay word for Monday, the first day of the workweek in Indonesia, Malaysia, Brunei, and Singapore’s Malay-speaking regions. It is used in calendars, schedules, and everyday language. In Indonesian, days of the week are commonly referred to with the word Hari as a prefix, as in Hari Senin, Hari Selasa, Hari Rabu, Hari Kamis, Hari Jumat, Hari Sabtu, and Hari Minggu; the shorter forms Senin, Selasa, and so on are also used in casual speech and on calendars.

The names Senin, Selasa, Rabu, Kamis, Jumat, Sabtu, and Minggu form part of a traditional Malay- and Javanese-influenced system for naming days in the Malay-speaking world. The exact historical origin of these day names is not definitively documented, but they have long been part of the regional linguistic landscape and are widely used across Indonesia, Malaysia, Brunei, and neighboring areas.

In modern practice, the ISO 8601 standard designates Monday as the first day of the week, a convention that is commonly reflected in Indonesian and regional calendars, as well as in business and school scheduling. Consequently, Senin typically marks the start of the work or school week in many contemporary contexts, though weekend patterns can vary by country and institution.