It seems like your query "how long ago was pm" could mean you want to know how much time has passed since a particular past moment marked by "pm" (post meridiem), which commonly refers to the afternoon or evening time on a 12-hour clock. If you're referring to how long ago a specific "pm" time was compared to now, the answer depends on the exact hour and minutes of that pm time. For example, if the current time is around 8:12 PM UTC on August 22, 2025:

• If you mean how long ago was 1 PM today, it was about 7 hours ago.
• If you mean how long ago was 5 PM today, it was about 3 hours ago.
• If you mean the previous day's 9 PM, that would be about 23 hours ago.

If you provide a specific pm time (e.g., 3:30 PM on a particular date), I can calculate how long ago it was from now. Without a specific reference, the answer varies with the exact time you are indicating. If you're asking about something else related to "pm," please clarify the context or provide more details. I can also help calculate the time difference precisely if you specify the exact pm time you are referring to.