Date and time notation in Mongolia
Date
The date format follows the Mongolian language, which has been big-endian. Consequently, it agrees with year first, month next, and day last. Example: . A leading zero is optional in practice (mostly not added). Cyrilic characters that mean year, month, and day are often used as separators too. Example: . Since the characters clearly label the date, the year may be abbreviated to two digits when this format is used.

In speech, the date is spoken in the same format as it is written. Using the example:  (pürev),  (Khoyor myanga doloon)  (ony)  (Naiman)  (saryn)  (Арван).

Ordinal Mongolian is a colloquial term used to express the day of the month instead of cardinal Mongolian. It is rarely used in formal writing. Using the example:  (pürev),  (Khoyor myanga doloon)  (ony)  (Naiman)  (saryn)  (Arvan dakhi). Ordinal Mongolian is more often used when the month is understood from the context, i.e.: 10 дахь for the 10th.

Weeks are most often identified by the last day of the week, either the Friday in business (e.g., "") or the Sunday in other use (e.g., ""). The first day of the week or the day of an event are sometimes referred to (e.g., "").

Time
The 12-hour clock is often used in spoken language. The 24-hour notation is used in writing, with a colon as the standardised and recommended separator. Example: .