Questions & Answers about Irgendwann möchte ich nach Kanada reisen.
irgendwann means at some (unspecified) time, usually understood as in the future unless context suggests the past. It is vague: you do not know when.
Comparisons:
irgendwann
- at some point, someday
- very vague time, often future
- Example: Irgendwann möchte ich nach Kanada reisen.
I would like to travel to Canada someday.
manchmal
- sometimes, occasionally
- describes something that happens repeatedly from time to time
- Example: Manchmal reise ich nach Berlin.
I sometimes travel to Berlin.
eines Tages
- one day, someday
- usually clearly future and has a slightly storytelling or dramatic tone
- Example: Eines Tages werde ich nach Kanada reisen.
One day I will travel to Canada.
So irgendwann = vague single point in time (someday), manchmal = repeated occasions (sometimes), eines Tages = someday in the future, a bit more narrative or emphatic than irgendwann.