This template takes four unnamed arguments:

|1=
The language code (see Wiktionary:List of languages).
|2=
The year.
|3=
The month.
|4=
The day of the month.

If there is a second date on which the word was a FWotD:

|5=
The second year.
|6=
The second month.
|7=
The second day of the month.

It should be placed immediately below the L2 header in the section of an entry that was featured as Foreign Word of the Day. For example, in tříčtvrtka:

==Czech==
{{was fwotd|cs|2015|October|12|2016|June|27}}