Steps to replicate the issue (include links if applicable):

• Make successful api requests to the following endpoints below:

• categories_metrics_snapshot
• edits_per_category_monthly
• edits_per_user_monthly
• media_file_metrics_snapshot
• pageviews_per_category_monthly
• pageviews_per_media_file_monthly
• media_file_metrics_snapshot

What happens?:

• Successful request calls to the endpoints returns time format: 2023-11-01 00:00:00.000Z instead of 2023110100

What should have happened instead?:

• Successful request calls to the endpoints should return time format: 2023110100

Software version (on Special:Version page; skip for WMF-hosted wikis like Wikipedia):
CIM

Other information (browser name/version, screenshots, etc.):