According to the BIN standard (NBN Z 01-002), there are 3 ways to write a date in Belgium:
All Belgian weeks begins on a Mon. at 00:00:00. In written language, time is expressed exclusively in 24-hour using a colon to separate h. and min. when writing "00:09" in Worldwide English, writing "0h09" in Belgian French, writing "0u09" in Belgian Dutch, writing "0U09" in East Cantonian German. In formal language, people to use the 24-hour.
References
Date and time notation in Belgium Wikipedia(Text) CC BY-SA