Hi Tim,
With this kind of dates (Timestamps) thats includes dates and times you have two conversion options:
Convert date to timestamp:
CONVERT DATE lv_date
TIME lv_time
INTO TIME STAMP lv_timestamp
TIME ZONE sy-zonlo.
Convert timestamp to date:
CONVERT TIME STAMP lv_timestamp
TIME ZONE sy-zonlo
INTO DATE lv_date
TIME lv_time.
In your scenario maybe you need to use CONVERT DATE sentence.
Best regards.