Denshi Jisho — Online Japanese dictionary

何時か いつか sometime; someday; one day; some time or other; the other day; in due course; in time
Adverb, Usually written using kana alone 
何時かは いつかは sooner or later; in due time; in due course
Adverb, Usually written using kana alone 
何時から いつから 1: (Usually written using kana alone) since when;
2: from when;
3: how long
Expression 
何時から なんじから from when; lit: from what hour
Expression 

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