The following code points exist related to clocks, watches, and other devices to indicate time:
⌚ U+0231A WATCH ⌛ U+0231B HOURGLASS ⏰ U+023F0 ALARM CLOCK ⏱ U+023F1 STOPWATCH ⏲ U+023F2 TIMER CLOCK ⏳ U+023F3 HOURGLASS WITH FLOWING SAND ⧖ U+029D6 WHITE HOURGLASS ⧗ U+029D7 BLACK HOURGLASS 📅 U+1F4C5 CALENDAR 📆 U+1F4C6 TEAR-OFF CALENDAR 🕐 U+1F550 CLOCK FACE ONE OCLOCK 🕜 U+1F55C CLOCK FACE ONE-THIRTY 🕑 U+1F551 CLOCK FACE TWO OCLOCK 🕝 U+1F55D CLOCK FACE TWO-THIRTY 🕒 U+1F552 CLOCK FACE THREE OCLOCK 🕞 U+1F55E CLOCK FACE THREE-THIRTY 🕓 U+1F553 CLOCK FACE FOUR OCLOCK 🕟 U+1F55F CLOCK FACE FOUR-THIRTY 🕔 U+1F554 CLOCK FACE FIVE OCLOCK 🕠 U+1F560 CLOCK FACE FIVE-THIRTY 🕕 U+1F555 CLOCK FACE SIX OCLOCK 🕡 U+1F561 CLOCK FACE SIX-THIRTY 🕖 U+1F556 CLOCK FACE SEVEN OCLOCK 🕢 U+1F562 CLOCK FACE SEVEN-THIRTY 🕗 U+1F557 CLOCK FACE EIGHT OCLOCK 🕣 U+1F563 CLOCK FACE EIGHT-THIRTY 🕘 U+1F558 CLOCK FACE NINE OCLOCK 🕤 U+1F564 CLOCK FACE NINE-THIRTY 🕙 U+1F559 CLOCK FACE TEN OCLOCK 🕥 U+1F565 CLOCK FACE TEN-THIRTY 🕚 U+1F55A CLOCK FACE ELEVEN OCLOCK 🕦 U+1F566 CLOCK FACE ELEVEN-THIRTY 🕛 U+1F55B CLOCK FACE TWELVE OCLOCK 🕧 U+1F567 CLOCK FACE TWELVE-THIRTY 🕰 U+1F570 MANTELPIECE CLOCK 🗓 U+1F5D3 SPIRAL CALENDAR PAD
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At unicode-table.com you might find more useful code points.