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Hi Mousmi Kumari,
Thanks for posting back.
For the two date columns, please check their settings via the down arrow of the column> Column settings> Edit, and make sure "Include Time" is enabled.
If the option is already enabled, please check if the two date columns have been applied JSON formatting. Please click the down arrow of the date column> Column settings> Format this column> click Advanced mode. Please backup the existing code, remove the code, click Save, then check if items after 12 show time in the date column.
We look forward to your response. Thanks for your cooperation.
Sincerely,
George | Microsoft Community Moderator