daylight

a command-line program for tracking sunrise and sunset times (Mac / Linux / Windows)

It tells you the sunrise, sunset, solar noon times and day length. It also projects these changes over the next ten days.

daylight uses your IP-based location and timezone to tailor the results to your geometry. It works in (ant)arctic locations, and you can override the IP location if you're travelling / on a VPN.

I love the sunlight and dread the long, dark winter evenings of Northern Europe. I often look up sunrise / sunset times and count off the days until the dreary darkness is gone.

(IP lookup is powered by https://ipinfo.io. They provide a good service so please don't spam requests.)

Daylight is provided under the GPL license.

Installation

Homebrew (MacOS and Linux)

# Add my tap (formula repository)
brew tap jbreckmckye/formulae
# Install daylight
brew install daylight
# Check it
daylight --help

Manual installation (and Windows)

Pick up the executable for your system in the releases. Unzip the package and put the program in a folder that's within your system PATH.

Usage

# Today's data for your IP location
daylight

# Override the IP location and timezone (allows offline operation)
daylight --latitude="-33.92" --longitude="18.42" --timezone="Africa/Johannesburg"

# Short summary of the data
daylight --short

# JSON version of summary
daylight --json

# Data for another date
daylight --date="2025-12-31"

# Disable the colour output
NO_COLOR=true daylight

# Show help
daylight --help

Daylight will attempt to adapt to your terminal background colour (dark vs light) but this might not work well for your colour scheme. In this case you can use NO_COLOR to disable any colours

$ NO_COLOR=true daylight

Today's daylight                                                            
════════════════════════════════════════════════════════════════════════════
                                                                            
                                                                      
             Rises                 Noon:                 Sets:        
             05:41                 12:58                 20:14        
                                                                      
                                                                      
                                                                      
Day length                                                                  
════════════════════════════════════════════════════════════════════════════
                                                                            
           Daylight for:                    versus yesterday:         
          14 hrs, 32 mins                        +3m 39s              
                                                                           
 .................R-------------------------------------------S........... 
                                                                           
Ten day projection                                                          
════════════════════════════════════════════════════════════════════════════
                                                                            
      ┌────────────────┬───────────┬───────────┬─────────────────────┐      
      │      DATE      │  SUNRISE  │   SUNSET  │       LENGTH        │      
      ├────────────────┼───────────┼───────────┼─────────────────────┤      
      │   Sun Apr 27   │   05:39   │   20:16   │   14 hrs, 36 mins   │      
      │   Mon Apr 28   │   05:37   │   20:17   │   14 hrs, 40 mins   │      
      │   Tue Apr 29   │   05:35   │   20:19   │   14 hrs, 43 mins   │      
      │   Wed Apr 30   │   05:33   │   20:21   │   14 hrs, 47 mins   │      
      │   Thu May 01   │   05:32   │   20:22   │   14 hrs, 50 mins   │      
      │   Fri May 02   │   05:30   │   20:24   │   14 hrs, 54 mins   │      
      │   Sat May 03   │   05:28   │   20:26   │   14 hrs, 57 mins   │      
      │   Sun May 04   │   05:26   │   20:27   │   15 hrs, 1 mins    │      
      │   Mon May 05   │   05:24   │   20:29   │   15 hrs, 4 mins    │      
      │   Tue May 06   │   05:23   │   20:31   │   15 hrs, 8 mins    │      
      └────────────────┴───────────┴───────────┴─────────────────────┘      
                                                                            
Your stats                                                                  
════════════════════════════════════════════════════════════════════════════
                                                                            
 LOCATION  Latitude 51.51, Longitude -0.1257        IP ADDRESS  146.90.4.96 
                                                                            
https://github.com/jbreckmckye/daylight                                     

There is also a short summary mode

$ daylight --short
Rises:  05:41
Sets:   20:14
Length: 14 hrs, 32 mins
Change: +3m 39s

Codebase

This project comes from pretty early in my journey to learn Go. It's always possible there are bugs. Feel free to raise issues.

The terminal UI library is lipgloss.

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