ref: c8e25d2a18c0395431abc5818a1d2f0561b0181f
dir: /sys/src/cmd/date.c/
#include <u.h> #include <libc.h> enum { Nsec = 1000*1000*1000, }; void usage(void) { fprint(2, "usage: date [-itunm] [-f fmt] [seconds]\n"); exits("usage"); } void main(int argc, char *argv[]) { int nflg, uflg; char *fmt; vlong s, ns; Tzone *tz; Tm tm; nflg = 0; uflg = 0; tz = nil; fmt = "WW MMM _D hh:mm:ss ZZZ YYYY"; tmfmtinstall(); ARGBEGIN{ case 'n': nflg = 1; break; case 'u': uflg = 1; break; case 't': fmt = "YYYY-MM-DDThh:mm:ssZZ"; break; case 'i': fmt = "YYYY-MM-DD"; break; case 'f': fmt = EARGF(usage()); break; default: usage(); }ARGEND s = 0; ns = 0; switch(argc) { case 0: ns = nsec(); s = ns/Nsec; ns = ns%Nsec; break; case 1: s = strtoll(argv[0], nil, 0); ns = 0; break; default: usage(); break; } if(!uflg && (tz = tzload("local")) == nil) sysfatal("timezone: %r"); if(tmtimens(&tm, s, ns, tz) == nil) sysfatal("now: %r"); if(nflg) print("%lld\n", tmnorm(&tm)); else if(print("%τ\n", tmfmt(&tm, fmt)) == -1) sysfatal("%r"); exits(0); }