# Expression Language in Moments

Use Expressions in [Moments](https://www.infobip.com/docs/moments) to specify variable values in Flow. You can update **variables** or **person profiles**.

By integrating Expression Language in Moments, you can:

- **Make calculations** - Count how many times a user received a voucher.
- **Calculate time difference** - Check delayed orders and then escalate automatically. Be aware that function `now()` returns `DateTime` in UTC by default, while other time functions apply account's time zone for calculation.
- **Concatenate unique URLs from variables and attributes** - Use it to report or send a feedback request URL.

Take a look at [Flow variables](https://www.infobip.com/docs/moments/manage-flow#flow-variables-settings) to learn more.