I need help finding a good word for the point in time where one day switches to the next. Obviously the actual point in time would be midnight, but i want a word to emphasize the fact that something is happening over the switching point between two days. So the word i'm looking for would be something like "day limit" or "day break", but neither of these sound very good.
If any kind of digital clock or calendar is in the picture, then rollover can describe this.
It needs a little context to make it clear: e.g. something like “Nominations open Saturday February 21, at the rollover” may not be understood by all readers, but “Nominations open at midnight, on the rollover from Fri 20 to Sat 21” should be well understood, as should “Nominations open Friday night, at the rollover from 11:59 to 12:00”.
I think that at the stroke of midnight is a useful expression that comes close to what you are looking for. It actually indicates the last moments of the day and the beginning of a new one.
- the sound of striking, as of a clock
You might try this :
On the cusp of a new day.
- On the threshold or verge of a development or action. (TFD)
Using some Latin, you might consider interdiurnum to be that instant that is between successive days (like interregnum is the time between successive reigns or regimes).
inter (Etymmonline) is
among, between, betwixt, in the midst of
of the day.
This purposefully overlooks the idea that for some cultures the day ends and begins at midnight, for other cultures the day ends and beings at sunset, or any other concept of when that instant might occur.
You don't really give a sense of how long an interval you want to include, but if it's fairly diffuse, why not overnight? That's the generally used term for the passage from one day to the next, considered in a wide, extended sense.
Perhaps changing of the day would work if you need a noun. As the new day began... would also work and would perhaps sound a little less awkward if a prepositional lead-in phrase will work for you.
Both of these indicate the transitioning to the new day rather than just denoting a particular instant.
A poetic offering,
the Hollow (or, hollowed) Hour, that interstice between the past and the future
- having a hole or empty space inside.
See, google.com “hollow” Link
the Hollow Hour = 00:00:00 and connotes the emptiness out of which all manifestation proceeds. "Hollowed" echoes, yet opposes, the concept of that which is "hallowed". This interstice in space or time is where all go to die; from where all are born anew. "This is where the world ends"; This is where it all begins again.
A small opening or space between objects
An interval of time required by the Roman Catholic Church between the attainment of different degrees of an order.
By extension, a small interval of time free to be spent on activities other than one's primary goal.
Figuratively, a fragment of space
see, the wiktionary “interstice” Link
through the night
We will be working through the night making the final touches.
Stick with midnight if you want to be perfectly clear.
Even though it is New Years Eve, we will be working through midnight until the normal shift change ends.
The sleepy animals hang up their furs Until a new awakening occurs
How poetic do you want to get? The end of something is call the "Terminus"... ie: "as the day reached its terminus..." The line of sunlight between night and day is called the Terminal. A stopping point along a route is called a terminal, the end of the line, the terminus.