Quite simple. Make the post to establish the timestamp, then check to see the seconds time of your post is. Then, edit your post to state what you got and your reaction.
Oh, and don't take the "spend the day" part too literally.
00 - Watching movies together
01 - Playing hide-and-seek
02 - Beating up the avatar
03 - Getting beaten up by the avatar
04 - Pranking neighbors
05 - Hugging
06 - Sailing the seas
07 - Eating sandwiches
08 - Playing chess
09 - Committing arson
10 - Golfing
11 - Clothes shopping
12 - Playing Minecraft
13 - Strip poker
14 - Handcuffed together
15 - Shoving the avatar into a meat grinder
16 - Drinking beer
17 - Being sick with the flu
18 - Snowball fight
19 - Stealing cars
20 - Solving mysteries
21 - Having tea
22 - Locked in jail
23 - Playing baseball
24 - Having a rap battle
25 - Going to the aquarium
26 - Skydiving
27 - Being the campaign manager for the avatar's political career
28 - Being stuck in a broken elevator
29 - Crossdressing
30 - Making out
31 - Being each other's wingmate on a double date
32 - Swallowed by a whale
33 - Fencing
34 - Going to a basketball game
35 - Running a lemonade stand
36 - Playing on a beach
37 - Trick-or-treating
38 - Drag racing
39 - Sleeping together (literal, nonsexual sense)
40 - Having a really nasty argument
41 - Babysitting a child
42 - Time travelled to the past
43 - Time travelled to the future
44 - Married for a day
45 - Running away from Godzilla
46 - Screwing in a lightbulb
47 - Falling into a ravine
48 - Lost in outer space
49 - Swimming in a pool
50 - Freaky Friday Flipped
51 - Reverted to 4 years old
52 - Having a romantic spaghetti dinner
53 - Attending a Broadway production
54 - Fighting crime with superpowers
55 - Dealing with poison ivy
56 - Eating pizza
57 - Playing video games
58 - Showering together
59 - Breaking into a bank
I got 32, so I'd spend the day with the above theoretical avatar swallowed by a whale. Yuck.
Edited by Parable on Aug 10th 2023 at 7:25:08 AM
Hydraloonie
With a bunny.
This is Fun!
edited 19th Sep '17 4:06:50 PM by Hydraloonie
Progress has it's stepping stones.
dork: silent assassin
Two blokes I never heard before.
Yeah, no. I'm a straight guy, I wouldn't mind the spaghetti, though.
edited 20th Sep '17 5:44:32 AM by ArmoredFury
Lovepilled and Hopemaxxing
Not an evil Thievul
With this big machine...guy?
It's...going to be kind of hard for them to hide...and nerve-wrecking when they're "it"...
edited 20th Sep '17 6:42:45 AM by kablammin45
"Lucian, don’t be afraid, we’ll make it through this."
The Best Worst Psychonaut
'Tis Marsha, the Swampert with the height of a Marshtomp!
Yeouch. Ah well, hopefully she can help us escape by filling it up with water. After she's done ranting, anyway.
edited 21st Sep '17 8:57:30 PM by PresidentStalkeyes
"If you think like a child, you will do a child's work."
Fly Air Madeline
I'm with Jet The Hawk. 
So I guess Jet has super wind powers and I have electricity or something. Let's go stop Hurricane Maria and rescue everyone in Puerto Rico.
edited 21st Sep '17 9:05:34 PM by lewattoo
"I'll show you all of Paris, I'll take you on a tour, we'll go up and up and up so high they'll long for an encore!"
Jer gets all the girls
Is that Trucy Wright?
Phew. That could've been extremely unfortunate. As it is this is gonna be mega awkward for all involved.
edited 21st Sep '17 9:36:29 PM by Murataku
Everybody's all "Jerry's old and feeble" till they see him run down a skyscraper and hijack a helicopter mid-flight.
Hydraloonie
With lycanroc.
AAAHH
edited 21st Sep '17 9:38:45 PM by Hydraloonie
Progress has it's stepping stones.
With this...Voltron lion? Actually, I don't know this one.
Ha! Two hands beats—wait, you're holding it in your mouth? Oh, Crap!
edited 22nd Sep '17 8:29:00 AM by TheGreatUnknown
Not an evil Thievul
With Nightmare Moon...(?)
Oh she is going to find me so annoying...
edited 22nd Sep '17 8:50:13 AM by kablammin45
"Lucian, don’t be afraid, we’ll make it through this."
Fly Air Madeline
I am with a pretty big Swampert named Marsha.
Isn't this technically bestiality?
edited 22nd Sep '17 9:59:18 AM by lewattoo
"I'll show you all of Paris, I'll take you on a tour, we'll go up and up and up so high they'll long for an encore!"
Hydraloonie
With Hat kid.
Barfs
edited 22nd Sep '17 10:22:22 AM by Hydraloonie
Progress has it's stepping stones.
Jer gets all the girls
Big evil kitty!
Please don't break my couch.
edited 26th Sep '17 7:33:17 PM by Murataku
Everybody's all "Jerry's old and feeble" till they see him run down a skyscraper and hijack a helicopter mid-flight.
Fly Air Madeline
With a cool spy guy.
The cool spy guy will make pranking extra fun. 
edited 26th Sep '17 10:24:59 PM by lewattoo
"I'll show you all of Paris, I'll take you on a tour, we'll go up and up and up so high they'll long for an encore!"
Not an evil Thievul
With this kid....
Huh, this could be fun.
edited 27th Sep '17 6:28:22 AM by kablammin45
"Lucian, don’t be afraid, we’ll make it through this."
dork: silent assassin
Ooh, a Treecko!
A bit too mundane, sure, but it could be worse.
edited 27th Sep '17 8:10:29 AM by ArmoredFury
Lovepilled and Hopemaxxing
The UMP40.
I've heard of "stripping your weapon", but this is ridiculous!
edited 3rd Oct '17 9:27:08 PM by TheGreatUnknown
How sweet it is
So, I'm with a bounty hunting weasel/wolf...
This is way too out of character for me...
edited 3rd Oct '17 9:16:04 PM by Berrenta
she/her | TRS needs your help! | Contributor of Trope Report
Meito Anizawa, Anime Tenchou
Me and pancake bunny!
...huh. Seems out of character for either of us...
edited 3rd Oct '17 9:50:18 PM by Zanreo
"Leftover items still have value!"
Fly Air Madeline
I'm with CATS. How are you gentleman?
All your cash are belong to us!
Cherish these few remaining moments of your wealth.
edited 4th Oct '17 7:07:35 AM by lewattoo
"I'll show you all of Paris, I'll take you on a tour, we'll go up and up and up so high they'll long for an encore!"
Not an evil Thievul
With this kid...
I'm so clumsy that I'm probably still going to lose at this miserably...
edited 4th Oct '17 7:08:12 AM by kablammin45
"Lucian, don’t be afraid, we’ll make it through this."
Fly Air Madeline
With this quiet croco-lady.
There's probably not many books in jail.
edited 5th Oct '17 5:33:53 AM by lewattoo
"I'll show you all of Paris, I'll take you on a tour, we'll go up and up and up so high they'll long for an encore!"
How sweet it is
With the Hat Kid...
We're screwing in a lightbulb? Hey, at least it's a mundane activity.
edited 5th Oct '17 7:56:35 AM by Berrenta
she/her | TRS needs your help! | Contributor of Trope Report
Not an evil Thievul
With this little bunny...
Hilarity Ensues. Everyone's noticing that I'm acting really funny and can't find out why...nor do they get why the rabbit nearby is desperately trying to get everyone's attention.
edited 5th Oct '17 8:03:56 AM by kablammin45
"Lucian, don’t be afraid, we’ll make it through this."
Is that a Vibrava?
Tch. Having a rap battle with an insect sure is fun.
edited 14th Oct '17 9:35:15 AM by TheTomatoFairy
Tales of Berseria - Burn
Marshaaaaaaaa (the big one, not the cat one)
Well balls, don't Pokemon have really supernatural strength? fukk.
edited 19th Sep '17 10:27:52 AM by Beverly
I'm Huney B now. Okay?