Link: https://www.zabbix.com/documentation/current/manual/api/reference/service/object

Problem:

In row "ts_from (required)" last words in description are:

"For onetime downtimes ts_from must be set as a Unix timestamp, for other types - as a specific time in a week, in seconds, for example, 90000 for Tue, 2:00 AM."

Similar error in row "ts_to ** (required)".

Should be:

... for example, 90000 for Mon, 1:00 AM.

Calendar for uptime/downtime repeated every week starts from Sunday.

Reproduction/explanation:

Define uptime or downtime period in frontend for some IT service as interval:

Look in to DB table services_times, column:

ts_from contains 0

ts_to contains 90000

Sunday 00:00 is written into table as 0 - so, this is weekly calendar start.

90000 seconds is a one day and one hour, so Sunday 00:00 + 1 day and 1 hour = Monday 01:00 AM