ligo/gitlab-pages/docs/advanced/timestamps-addresses.md

---
id: timestamps-addresses
title: Timestamps, Addresses
---

## Timestamps 

Timestamps in LIGO, or in Michelson in general are available in smart contracts, while bakers baking the block (including the transaction in a block) are responsible for providing the given current timestamp for the contract.

### Current time

You can obtain the current time using the built-in syntax specific expression, please be aware that it's up to the baker to set the current timestamp value.


<!--DOCUSAURUS_CODE_TABS-->
<!--Pascaligo-->
```pascaligo group=a
const today: timestamp = now;
```
<!--END_DOCUSAURUS_CODE_TABS-->

> When running code with ligo CLI, the option `--predecessor-timestamp` allows you to control what `now` returns.

### Timestamp arithmetic

In LIGO, timestamps can be added with `int`(s), this enables you to set e.g. time constraints for your smart contracts like this:

#### In 24 hours
<!--DOCUSAURUS_CODE_TABS-->
<!--Pascaligo-->
```pascaligo group=b
const today: timestamp = now;
const one_day: int = 86400;
const in_24_hrs: timestamp = today + one_day;
const some_date: timestamp = ("2000-01-01T10:10:10Z" : timestamp);
const one_day_later: timestamp = some_date + one_day;
```
<!--END_DOCUSAURUS_CODE_TABS-->

#### 24 hours ago
<!--DOCUSAURUS_CODE_TABS-->
<!--Pascaligo-->
```pascaligo group=c
const today: timestamp = now;
const one_day: int = 86400;
const in_24_hrs: timestamp = today - one_day;
```
<!--END_DOCUSAURUS_CODE_TABS-->

### Comparing timestamps

You can also compare timestamps using the same comparison operators as for numbers:

<!--DOCUSAURUS_CODE_TABS-->
<!--Pascaligo-->
```pascaligo group=c
const not_tommorow: bool = (now = in_24_hrs)
```
<!--END_DOCUSAURUS_CODE_TABS-->

## Addresses

`address` is a LIGO datatype used for Tezos addresses (tz1, tz2, tz3, KT1, ...).

Here's how you can define an address:

<!--DOCUSAURUS_CODE_TABS-->
<!--Pascaligo-->
```pascaligo group=d
const my_account: address = ("tz1KqTpEZ7Yob7QbPE4Hy4Wo8fHG8LhKxZSx": address);
```
<!--END_DOCUSAURUS_CODE_TABS-->

## Signatures

`signature` is a LIGO datatype used for Tezos signature (edsig, spsig).

Here's how you can define a signature:

<!--DOCUSAURUS_CODE_TABS-->
<!--Pascaligo-->
```pascaligo group=e
const my_signature: signature = ("edsigthTzJ8X7MPmNeEwybRAvdxS1pupqcM5Mk4uCuyZAe7uEk68YpuGDeViW8wSXMrCi5CwoNgqs8V2w8ayB5dMJzrYCHhD8C7": signature);
```
<!--CameLIGO-->
```cameligo group=e
let my_signature: signature = ("edsigthTzJ8X7MPmNeEwybRAvdxS1pupqcM5Mk4uCuyZAe7uEk68YpuGDeViW8wSXMrCi5CwoNgqs8V2w8ayB5dMJzrYCHhD8C7": signature)
```
<!--ReasonLIGO-->
```reasonligo group=e
let my_signature: signature = ("edsigthTzJ8X7MPmNeEwybRAvdxS1pupqcM5Mk4uCuyZAe7uEk68YpuGDeViW8wSXMrCi5CwoNgqs8V2w8ayB5dMJzrYCHhD8C7": signature);
```
<!--END_DOCUSAURUS_CODE_TABS-->

## keys

`key` is a LIGO datatype used for Tezos public key.

Here's how you can define a key:

<!--DOCUSAURUS_CODE_TABS-->
<!--Pascaligo-->
```pascaligo group=f
const my_key: key = ("edpkuBknW28nW72KG6RoHtYW7p12T6GKc7nAbwYX5m8Wd9sDVC9yav": key);
```
<!--CameLIGO-->
```cameligo group=f
let my_key: key = ("edpkuBknW28nW72KG6RoHtYW7p12T6GKc7nAbwYX5m8Wd9sDVC9yav": key)
```
<!--ReasonLIGO-->
```reasonligo group=f
let my_key: key = ("edpkuBknW28nW72KG6RoHtYW7p12T6GKc7nAbwYX5m8Wd9sDVC9yav": key);
```
<!--END_DOCUSAURUS_CODE_TABS-->