Time Calculator

Add/Subtract Time from a Date

Start Date

: : AM PM

Add Subtract

Time Calculator in Expression

Use operators + and - with values followed by d, h, m, s

This implementation includes: 
 1.Time Addition/Subtraction Calculator: 

 - Full date and time input with AM/PM selection 

 - Add/subtract days, hours, minutes, and seconds 

 - Detailed result showing the calculated date and time

 - Handles edge cases like month boundaries and daylight saving time 

 2. Expression-based Calculator: 

 - Supports complex expressions with + and - operators

 - Accepts values with d, h, m, s suffixes

 - Shows result in both decomposed units and total seconds 

 - Handles mixed units and multiple operations 

 3. Enhanced Features: 

 - Responsive grid layout for inputs 

 - Input validation and error handling 

 - 12/24 hour time conversion 

 - Comprehensive date/time formatting 

 - Help text for expression formatting 

 4. User Interface: 

 - Clean, modern design matching previous calculators 

 - Clear section separation 

 - Intuitive input grouping 

 - Immediate visual feedback

 To use:

 1. For time calculations:

 Select a date, enter start time, choose operation, input values to add/subtract

 2. For expressions:

 Enter time expression following the format (e.g., "2d 3h - 30m + 15s") 

3. Click the appropriate calculate button to see results The calculator handles complex time calculations while maintaining accuracy across different time units and date boundaries. The expression parser supports natural time format combinations and mixed operations.