Panchak is the stretch with the Moon in Kumbha or Meena — equivalently, from the second half of Dhanishtha through Revati, since Dhanishtha's midpoint is exactly the Kumbha cusp. It comes round about every 27 days and lasts roughly five, which is where the name comes from. Five specific acts are avoided in it — roofing a house, gathering fuel, making a bed, travelling south, and cremation without the prescribed rites — rather than auspicious work in general.
Avoided for weddings and other new undertakings
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15Jan15 Jan → 19 JanThursday
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11Feb11 Feb → 15 FebWednesday
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10Mar10 Mar → 14 MarWednesday
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6Apr6 Apr → 10 AprTuesday
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3May3 May → 7 MayMonday
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30May30 May → 4 JunSunday
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27Jun27 Jun → 1 JulSunday
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24Jul24 Jul → 28 JulSaturday
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21Aug21 Aug → 25 AugSaturday
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17Sept17 Sept → 21 SeptFriday
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14Oct14 Oct → 18 OctThursday
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11Nov11 Nov → 15 NovThursday
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8Dec8 Dec → 12 DecWednesday
All times are IST, computed for Ujjain. A tithi or nakshatra turns at the same instant everywhere, so your timezone changes only the clock it reads — but a window bounded by the weekday also follows your own sunrise. The app computes both for your city.