Service Manager

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DiffDays

This function uses the whole interval method to calculate the difference in days. If you need to calculate the number of days using the boundary crossing method, use the DateDiffSQL function instead.

See Date Functions for more information about using the whole interval method versus using the boundary crossing method.

Syntax

DiffDays(startDateTime, endDateTime, timeZone)

Enabled For

For a description of the business object categories, see Notes on "Enabled For".

Business Object Category	Yes/No
Business Rules: Before-Save Rules	Yes
Business Rules: Calculation Rules (After Save, with or without Also Recalculate on Load)	Yes
Business Rules: Calculation Rules (Before Save or Always, without Also Recalculate On Load)	Yes
Business Rules: Calculation Rules (Before Save or Always, with Recalculate On Load)	Yes
Business Rules: Editing Rules	Yes
Business Rules: Initialization Rules	Yes
Business Rules: Read Only Rules	Yes
Business Rules: Required Rules	Yes
Business Rules: Validation Rules	Yes
Client Expressions	Yes
Object Permissions	Yes
Services	Yes
LDAP	Yes
Mobile	Yes
Quick Actions (except UI Quick Actions)	Yes
UI Quick Actions	Yes
Reports	Yes
Search/Dashboard without field references	Yes
Search/Dashboard with field references	Yes

Parameters

startDateTime	The start date and time to be compared.
endDateTime	The end date and time to be compared.
timeZone	(Optional) The time zone, in IANA format.   NOTE: This parameter is optional.  If you specify a time zone, the system assigns that time zone to both the startDateTime and endDateTime parameters. If you do not specify a time zone, the system uses the time zone associated with the current session.

Returns Value

Number value.

If the startDateTime parameter is later than the endDateTime parameter, the returned value is positive. If the startDateTime parameter is earlier than the endDateTime parameter, the returned value is negative.

Example

To prevent an incident from being updated after 60 days from the time it was created, you could create a read-only rule with the following:

$(Status == "Closed" || DiffDays(CreatedDateTime, CurrentDateTime())<60)

All incidents that are either closed or are more than 60 days old, become read-only.