# Date, Time & Duration Calculator Instructions

Add and subtract dates, times, and durations in Calcul.io; compare dates, convert time zones, and calculate practical calendar intervals.

## Time and Dates

### Relative Date Calculations

calcul.io understands everyday language for dates. Try these:

```calculio
today
tomorrow
yesterday
last week
next friday
```

But it's still a math app first and foremost. So why not a bit of calculations?

```calculio
today + 3 days
next month - 1 week
yesterday + 14 days
```

### Date Arithmetic

Perform calculations with specific dates or mix them with relative terms:

```calculio
25/12/2023 + 100 days
01/01/2024 - today
next year - 6 months
```

### Time Span Calculations

Find out the duration between two dates:

```calculio
now - 01/01/1970
31/12/2025 - today
yesterday - last week to days
```

With calcul.io, crunching dates is as easy as pie. Give it a try and say goodbye to date-related headaches!

Unlock the power of **precise time management** with our cutting-edge *date and time calculator*. Whether you're planning projects, scheduling events, or tracking deadlines, our tool offers **instant calculations** for all your *temporal needs*. Experience the convenience of **accurate time computation** and streamline your workflow today!

[Next: **Examples**](https://calcul.io/examples/index.md)

**Table of content**

- [Introduction](https://calcul.io/instructions/index.md)
- [Units and conversions](https://calcul.io/instructions/conversions/index.md)
- [List of units](https://calcul.io/instructions/units/index.md)
- [Functions](https://calcul.io/instructions/functions/index.md)
- [Constants](https://calcul.io/instructions/constants/index.md)
- [Currencies, crypto, stock](https://calcul.io/instructions/currency/index.md)
- [Time and dates](https://calcul.io/instructions/time/index.md)