How to mask a circle to open gradually?

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J’ai trouvé ceci.
I found this

Time stamp help

There is an advanced feature for the text filter that might meet your needs. The time based keywords can be succeeded by an strftime compatible code that specifies the format of the time. For example, #createdate %I:%M:%S %p# will display the time as “01:12:44 PM” The keywords that support this feature are: createdate, filedate, localfiledate, and localtime The strftime format specification can be found here: http://man7.org/linux/man-pages/man3/strftime.3.html This feature is poorly docu…

Et ceci à propos des strftime formats
And this about strftime formats

PHP: strftime - Manual