• 今日きょう — today
• 今週こんしゅう — this week
• 今回こんかい — this time
• 今月こんげつ — this month
• 今後こんご — from now on / going forward
• 今度こんど — this time / next time

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• 古今ここん — past and present
• 昨今さっこん — nowadays / recent times
• 今般こんぱん — this occasion (formal)
• 今朝けさ — this morning
• 今昔こんじゃく — past and present (literary)

The character 今 originally suggested something being “contained” or “held” in the present — and it came to mean “now.” It’s used widely in time words like 今日, 今週, and 今後.