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def time.jan1

ezsys@0.1.0.0 · src/clock.bend:313

import ezsys@0.1.0.0/src/clock.bend as Clock
import Base

313# the day number of 1 January of a year from 1970 on: Howard Hinnant's
314# days_from_civil for month 1, day 1
315def time.jan1(year: U32) -> U32:
316  +yr = (year - 1 : U32)
317  +era = (yr / 400 : U32)
318  +yoe = (yr - era * 400 : U32)
319  (era * 146097 + yoe * 365 + yoe / 4 - yoe / 100 + 306 - 719468 : U32)

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