Hi Achintya,
The limitations of Time-dependent workflow in Salesforce:
- Time triggers don’t support minutes or seconds.
- Time triggers can’t reference the following:
- DATE or DATETIME fields containing automatically derived functions, such as TODAY or NOW.
- Formula fields that include related-object merge fields.
- You can’t add or remove time triggers if:
- The workflow rule is active.
- The workflow rule is deactivated but has pending actions in the queue.
- The workflow rule evaluation criteria is set to Evaluate the rule when a record is: created, and every time it’s edited.
- The workflow rule is included in a package.