Temporal case
The temporal case in morphology is used to indicate a time.
In the Hungarian language its suffix is -kor. For example: hétkor "at seven" or hét órakor "at seven o'clock", éjfélkor "at midnight", karácsonykor "at Christmas". This is one of the few suffixes in Hungarian to which rules of vowel harmony do not apply.
In Finnish its suffix is -lloin / -llöin. For example: milloin - when?; jolloin - when? ; tällöin - at this time; silloin - then; tuolloin - at that time.
In Russian the function of Temporal case is assumed by Instrumental, e.g. утр-ом - in the morning, дн-ём - in the daytime/in the afternoon, вечер-ом - at night/in the evening, ночь-ю - at nighttime/in the night.
