---
title: Date and time
summary: null
url: https://www.fastly.com/documentation/reference/vcl/functions/date-and-time
---

Interfaces for parsing numbers as time values and manipulating time values.

- [parse_time_delta](https://www.fastly.com/documentation/reference/vcl/functions/date-and-time/parse-time-delta/)
- [std.integer2time](https://www.fastly.com/documentation/reference/vcl/functions/date-and-time/std-integer2time/)
- [std.time](https://www.fastly.com/documentation/reference/vcl/functions/date-and-time/std-time/)
- [strftime](https://www.fastly.com/documentation/reference/vcl/functions/date-and-time/strftime/)
- [time.add](https://www.fastly.com/documentation/reference/vcl/functions/date-and-time/time-add/)
- [time.hex_to_time](https://www.fastly.com/documentation/reference/vcl/functions/date-and-time/time-hex-to-time/)
- [time.interval_elapsed_ratio](https://www.fastly.com/documentation/reference/vcl/functions/date-and-time/time-interval-elapsed-ratio/)
- [time.is_after](https://www.fastly.com/documentation/reference/vcl/functions/date-and-time/time-is-after/)
- [time.runits](https://www.fastly.com/documentation/reference/vcl/functions/date-and-time/time-runits/)
- [time.sub](https://www.fastly.com/documentation/reference/vcl/functions/date-and-time/time-sub/)
- [time.units](https://www.fastly.com/documentation/reference/vcl/functions/date-and-time/time-units/)