# Get the tomorrow date

Add one calendar day in UTC.

Canonical: https://1loc.dev/date-time/get-the-tomorrow-date/
Version: 1.0.0
Runtime: JavaScript · Node.js 22 / modern browsers
Verification: Local fixtures; no external services
Updated: 2026-10-28

## Implementation

```javascript
function tomorrow(date) { const d = new Date(date); d.setUTCDate(d.getUTCDate() + 1); return d.toISOString().slice(0, 10); }
```

## Input

```json
"2026-10-28"
```

## Expected output

```json
"2026-10-29"
```

## Edge case

Input:
```json
"2026-12-31"
```
Output:
```json
"2027-01-01"
```

## Limits

- The original’s second variant added 24 hours, which is not one day across a daylight-saving change.

The lab validates types and size before calling this function. Add equivalent validation at your own trust boundary.

## Source and license

Original: https://github.com/phuocng/1loc/blob/14b481cf60dff1620ab1bb99a43b1f68068cdd9b/contents/get-the-tomorrow-date.mdx
Author: Nguyen Huu Phuoc and original contributors
Contributors: See original repository history
Source commit: 14b481cf60dff1620ab1bb99a43b1f68068cdd9b
Copyright (c) 2020 phuoc-ng
License: MIT — https://1loc.dev/licenses/
Maintainer: Oveyon
Modifications: Adds a calendar day in UTC; the original's second variant added 24 hours. Original MDX retained as inert source evidence.