Excel cell date format

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The date displayed in the locally opened Excel file is in this custom format. When uploaded to the only office and opened, it automatically changes to a number, resulting in inconsistency. Is it a bug or something that needs to be modified by roommates.

Hello, what is the Document Server version you are using?
Also, please provide the original file where the issue is reproduced.

version:7.5.1 Self compiled community version。
4月残疾人工资、独生子女补贴、退休返聘、借调人员.xls (27 KB)

I would like to know how to configure the content of custom cell formats, as shown in the following figure:

Hello, the issue is not reproduced on recent 8.0.1 version, please update and check