# Recurrence syntax
**URL:** https://cylc.discourse.group/t/recurrence-syntax/894
**Category:** Cylc Support
**Created:** [February 20, 2024, 12:24pm UTC](https://cylc.discourse.group/t/recurrence-syntax/894 "2024-02-20T12:24:35Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@schaferk](https://cylc.discourse.group/u/schaferk)
#### Post date: [February 20, 2024, 12:24pm UTC](https://cylc.discourse.group/t/recurrence-syntax/894/1 "2024-02-20T12:24:35Z")
cylc 7 suite (yes 7)
task to run hourly except hours 00,01,02 at minutes 02,17,32,47 (every 15 minutes)
[scheduling]
initial cycle point = previous(T-02; T-17; T-32; T-47)
I understood from documentation
[9.3.4.3 Excluding Dates](https://cylc.github.io/cylc-doc/7.9.3/html/suite-config.html)
to exclude hours 00,01,02
[[dependencies]]
[[[PT15M ! (T00, T01, T02)]]]
this does not seem to work though as the task was executed at 00:02,00:17,…,01:02,…
obviously, I/m missing something.
reading about ISO 8601 Recurrence syntax, I thought (but did not try)
R/2024-02-20T03:02:00Z/PT15M
as I want the suite to start at the nearest 02,17,32,47 of the hour regardless of the date, e.g. previous(T-02; T-17; T-32; T-47)
guidance gladly received.
---
### Author:  [@oliver.sanders](https://cylc.discourse.group/u/oliver.sanders)
#### Post date: [February 20, 2024, 1:02pm UTC](https://cylc.discourse.group/t/recurrence-syntax/894/2 "2024-02-20T13:02:40Z")
Hi,
(Cylc 7 / 8 work the same regards cycling recurrences)
T01 is short for T01:00.00, so `PT15M ! (T00, T01, T02)` is short for `PT15M ! (T0000, T0100, T0200)` which isn’t what you wanted.
So what you need is this:
```auto
PT15M ! (T0000, T0015, T0030, T0045, T0100, T0115, ...
```
---
### Author:  [@schaferk](https://cylc.discourse.group/u/schaferk)
#### Post date: [February 20, 2024, 1:13pm UTC](https://cylc.discourse.group/t/recurrence-syntax/894/3 "2024-02-20T13:13:10Z")
thank you os.
obviously I didn/t read carefully regarding ‘is short for…’ in the cylc docs.