If you need to know what age animals will be on a certain date, or a date in which an animal will be a certain age, you can create custom animal fields called Age to Date to Age in System Settings - Animals - Additional Information.
To set Date to age, enter the desired age.
To Set Age to Date, enter the desired date.
mLIMS will calculate the date based on the age (in weeks or days) entered, or the age based on the date you enter.