def tz.off.pick
import cswap-bend-cli@0.1.0.0/clock.bend as Clockimport Base
166def tz.off.pick(ok: Bool, neg: Bool, +mag: U32) -> Maybe<&2, U32>:
167 match ok:
168 case False{}:
169 None{}
170 case True{}:
171 Some{sel(neg, (86400 - mag : U32), (86400 + mag : U32))}