Фразу "ему не до того сейчас" можно перевести как-то вроде "He has more pressing issues [to cope/deal with] at the moment."

А имеется ли какое-то английское идиоматическое соотвествие русского выражения "кому-то не до чего-то"?

а можно и покороче:

he's got bigger fish to fry, he's got too much on his plate..

he is in no mood to..

he is not in the party mood

P.S. Нашел еще вариант: "He's not up to it now."

or ......

* 'he's got a lot on his mind (at the moment)' [=he has a lot of things to worry about]

* 'he's got a lot going on right now' [=he's very busy]

* 'he's snowed under at the moment' [=he's very busy] [from the idea of having been hit by an 'avalanche' of tasks/problems to sort out]

How about this one? I guess the phrase could work in certain contexts.

He's got other things to worry about right now.

"he is (too) busy doing/with other things"

"he has other things to think of"

tinyurl.com/5bajaztp

He's got other things to worry about right now.

Извините, если где-то задел Вас, но заметил, что часто очень категорично себя ведете. И немного грубовато. Это не всем может нравиться.

Вот пример:

Da’Shana slipped the cell phone into her tight black jeans and looked up at Carol. Before Da’Shana could say anything, Carol said, “I know you’ve got other things to worry about right now [ЗНАЮ, ТЕБЕ СЕЙЧАС НЕ ДО ЭТОГО] , but about those false credit card charges, maybe you should look closer to home.”

“What’s that supposed to mean?” Da’Shana snapped. A waft of cigarette smoke and urine penetrated the small entryway as Carol reopened the front door.

“For starters, maybe you should ask Samika where he got the gold chain with the crucifix and diamond earring. How does a fourteen-year-old without a job afford those things?”

Автор - Douglas Canter

Примеров в сети валом. Если что, можно еще привести.

You never know where you might find The Next Big Star. According to legend, a talent agent spotted Lana Turner at Schwab’s Pharmacy on Sunset Boulevard, and America had itself another sweetheart.

If you can discover a movie star inside a drug store, why not scan the aisles of a grocery store? Aileen Campbell-Reid, a Los Angeles talent manager and acting coach, was shopping at Vons a few months ago when a tall young man caught her eye.

“Hey, there’s a stunner,” she blurted out to her husband, almost frantically.

The young man appeared attractive, poised and confident. He had movie star written all over him.

Campbell-Reid followed the young man and his friends outside the store and into the parking lot. Her husband overheard the group talking about the UCLA football team, so he asked whether anyone knew a guy named Brian Poli-Dixon.

The “stunner” spoke up.

“I’m Brian Poli-Dixon,” he said.

Small world, indeed. Campbell-Reid had moved here from Tucson to open an acting school. Poli-Dixon had moved here from Tucson to play football at UCLA. In elementary and junior high school, when he was a child actor, Campbell-Reid was his agent.

In the grocery store, she did not recognize him. The little kid had grown into a 6-foot-5 man. So Campbell-Reid and Poli-Dixon exchanged hugs and memories, and the two went their separate ways, but not before she slipped a business card into his hand.

“Look me up,” she said.

Fret not, Bruin fans. You may suffer the pain of losing a junior or two to the NFL after the season, but Poli-Dixon promises you will not suffer the pain of losing this junior to Hollywood.

“I’ve got other things to worry about right now,” Poli-Dixon said. “I don’t want people to think I’m getting sidetracked. I’m not playing the way I want to now. I have to worry about what I’m here for first. If other things fall into place, then maybe I can look into that.”

'Worry' здесь подразумевает "думать".

forum

an area of a website where users can post comments and have discussions

-- Collins English Dictionary.

However, I don't think 'He's got other things to worry about right now' necessarily means that the speaker thinks the party is also a 'worry'; it's just a common expression meaning that the person has other things to do, or problems to sort out, which are more important/more pressing than (going to a party or whatever).

you’ve got other things to worry about right now BUT false credit card charges are also troubling.

Вот здесь - 25.04.2021 21:20 - смотрИте. Четко все объяснил человек:

"However, I don't think 'He's got other things to worry about right now' necessarily means that the speaker thinks the party is also a 'worry'; it's just a common expression meaning that the person has other things to do, or problems to sort out, which are more important/more pressing than (going to a party or whatever)."

No hard feelings.

I don't think 'He's got other things to worry about right now' necessarily means that the speaker thinks the party is also a 'worry'

А я где-то сказал, что "the party is also a 'worry'"? Я как раз обратное сказал, что вечеринка не есть "other thing to worry about", и именно поэтому "other" здесь не к месту.

Вчитайтесь внимательно в вашу же фразу:

He's got other things to worry about right now.

This think to worry about AND other things to worry about. Но ведь вечеринка не есть что-то, о чем надо беспокоится, что и подтвердил Джон.

Точно так же выражение "Ему сейчас не до того" может быть употреблено двояко, не обязательно однозначно подразумевая, что у чела, мол, сейчас забот невпроворот. Например, если к парню на огонёк заглянула попить чайку знакомая стриптизёрша, на кой ляд здалась ему та вечеринка?...