Carl Linnaeus, The Lapland Journey, translated by Peter Graves (Edinburgh: Lockharton Press, 1995), p. 161.
Jokkmokk [2], 26/07/1732, ¶874:
It is very strange that the Lapps do not have any calendars except for a sort of rune-staff consisting of 7 small pieces of wood. They do have names for their months though they do not reckon by the months as we do but by the names of the feast days that they keep. They have a name for each week. They do not know in advance about eclipses of the sun and moon. The calendar for the year starts on the Friday before Christmas etc.