Time/Numbers

Duration Calculator

Sum or subtract several durations — handy for tallying worked hours, video length, or total task time.

An empty field counts as 0. The ± button toggles adding/subtracting the row.


                    

                

            

        

    


                            
                                

                    

                
Similar tools


                

                                            
                            
Unix Timestamp ↔ Date

                            
Convert Unix time to a date and back, with support for arbitrary (IANA) time zones.

                        
                                            
                            
Cron Parser

                            
Parse a cron expression (5 or 6 fields, including @-shortcuts) — a plain-language schedule description and next run times in a chosen time zone.

                        
                                            
                            
Number Base Converter

                            
Convert between binary, octal, decimal, hexadecimal, and any arbitrary (2-36) base — enter a number into any field.

                        
                                            
                            
Bitwise Operations

                            
AND/OR/XOR/NAND/NOR/XNOR/NOT and shifts on integers of a given width (8/16/32/64 bits) in any number base.

                        
                                            
                            
Date Diff Calculator

                            
Exact difference between two dates/times — calendar breakdown (years, months, days…), total duration, and business day count.

                        
                                            
                            
Age Calculator

                            
Exact age from a birth date — years/months/days, total time lived, and the next birthday.

                        
                                    

            

        
                    

                
Other tools


                

                                            
                            
Cookie Parser

                            
Parse a Set-Cookie header or a Cookie/document.cookie string into name, value, attributes, and a check for common security mistakes.

                        
                                            
                            
JSON Repair

                            
Fix broken JSON — trailing commas, single quotes, unquoted keys, comments, Python literals (True/False/None), and more — with a full list of every fix applied.

                        
                                            
                            
String Escape

                            
Escape text into a string literal (quotes, backslash, control characters) for pasting into code, or unescape it back.

                        
                                            
                            
QR Code Generator / Reader

                            
Generate a QR code from text or a URL, or read the content of an uploaded QR code image.

                        
                                            
                            
XML Entities Encode/Decode

                            
Encode and decode XML entities — the 5 predefined ones (ampersand, angle brackets, apostrophe, quote) and numeric character references.

                        
                                            
                            
PBKDF2 Hash + Verify

                            
Derive a key with PBKDF2 (RFC 8018) from a password, HMAC-SHA1/256/384/512, with a configurable iteration count.