FIRST_OF_YEAR - AtlasOfLivingAustralia/ala-dataquality Wiki
The month given is January (or 1), and a day value has not been given, or is the first of January.
Implications and caveats
While it is reasonable the occurrence may have been observed on the frst of the year, this flag also indicate the date may only be known or recorded to the year.
Data custodian recommendations
Check whether other records in the dataset provided from the same source have multiple month values or just the first of January.