A report subscription is setup to send an email message on regular schedule. The report is included in the email as an attachment file rendered in excel format.
When MS-Windows users receive the email, they can open the excel file and dates will be shown in a normal date format:
When iPad users receive the email, they can open the excel file, but the dates are shown as numbers:
Standard solution for MS-Windows users
However on the iPad the date in column H will be shown as a number.
Workaround for iPad users
In the report design do not use a custom format property; instead use an expression with the Format function to represent the date:
The result from the report subscription email attachment looks like this on the iPad:
With the workaround, the MS-Windows user will see the dates visualized correctly, but the cells are treated as plain text, not as dates. The cells are also left-aligned like any standard text.