Unix Timestamp Converter

Convert Unix timestamps to readable dates, generate current timestamps and debug log, JWT and scheduling issues.

Timestamp conversion 

        

    

                

            
                    

                        
How to use this tool

                        
    
                                                            
  1. Paste a Unix timestamp in seconds or milliseconds.
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  2. Convert it to local time, UTC and ISO format.
    3. 
                                                            
  3. Use the current timestamp button for logs, JWT testing and automation scripts.
    4. 
                                                    

                    


                    

                        
Common mistakes

                        
    
                                                            
  • Mixing seconds and milliseconds between JavaScript, APIs and databases.
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  • Comparing local time with UTC logs without converting.
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  • Using client time when server time is the source of truth.
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FAQ

                        

                                                            

                                    Does JavaScript use seconds or milliseconds?
                                    
Date.now returns milliseconds, while many APIs and JWT claims use seconds.

                                

                                                            

                                    Which timezone is ISO output?
                                    
ISO strings ending in Z are UTC. The tool also shows local browser time.

                                

                                                            

                                    Can I generate current timestamps?
                                    
Yes. It outputs current seconds, milliseconds and ISO date.

                                

                                                    

                    


                        

        
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Related guides and fixes

        

                                                
                        JWT
                        Debug JWT exp, iat and nbf Claims
                        
JWT time bugs often come from seconds versus milliseconds, timezone confusion or trusting decoded payloads without signature verification.

                    
                                                                            
                        JWT
                        JWT Expired But Token Looks Valid Fix
                        
A decoded JWT can look fine while still being expired, not yet valid, signed with the wrong key or meant for a different audience.

                    
                                                                
                        Cron
                        Cron Job Not Running Fix
                        
Cron failures often come from environment differences rather than the command itself. Reproduce with the same shell, paths and user.

                    
                                    

    

                        
Last updated: May 17, 2026