The US and the EU moves to Daylight Saving Time (DST) at different dates.
- The US moves the clocks forward one hour on the morning (2AM) of the second Sunday in March. In 2020, this is March 8th
- The EU moves the clocks forward one hour on the morning (1AM) of the last Sunday in March. In 2016, this is March 29th
In this period, the time difference between the EU and the US is one hour LESS than it usually is. One example: While the difference between UK/London time and servertime (US/Boston time) is usually 5 hours, it will only be 4 hours until the EU clocks move. This has a lot of impact on event planning in LOTRO, so make sure you know which times you use.
Here is more information on DST and event planning in LOTRO.