Here is an example of how to return the current date and time.

const timestamp = () => Date()
console.log(timestamp());

Which should return something like this.

Mon May 22 2023 00:41:47 GMT-0500 (Central Daylight Time)

toUTCString can be used to return the date and time in UTC / GMT.

const timestamp = () => `${new Date().toUTCString()}`
console.log(timestamp());

Which should return something like this.

Mon, 22 May 2023 05:44:22 GMT

toISOString can be used to return the date as an ISO string.

const timestamp = () => `${new Date().toISOString()}`
console.log(timestamp());

Which should return something like this.

2023-05-22T05:45:58.662Z

replace can be used to replace the letter "T" with a space and the trailing period with nothing.

const timestamp = () => `${new Date().toISOString().replace(/T/, ' ').replace(/\..+/, '')}`
console.log(timestamp());

Which should return something like this.

2023-05-22 05:45:58