[hackers] [sbase] date: Just set TZ to handle -u flag || Michael Forney

[git]

commit 1b41610a820215cdc569129e1cada5c6267fcecb
Author:     Michael Forney <mfor...@mforney.org>
AuthorDate: Sun Sep 3 11:39:12 2017 -0700
Commit:     Michael Forney <mfor...@mforney.org>
CommitDate: Sun Sep 3 11:39:12 2017 -0700

    date: Just set TZ to handle -u flag
    
    This simplifies things a tiny bit, and is also necessary for setting the
    date since mktime operates based on the value of TZ.

diff --git a/date.c b/date.c
index 1671e1f..7201227 100644
--- a/date.c
+++ b/date.c
@@ -15,9 +15,8 @@ int
 main(int argc, char *argv[])
 {
        struct tm *now;
-       struct tm *(*tztime)(const time_t *) = localtime;
        time_t t;
-       char buf[BUFSIZ], *fmt = "%c", *tz = "local";
+       char buf[BUFSIZ], *fmt = "%c";
 
        t = time(NULL);
 
@@ -26,8 +25,8 @@ main(int argc, char *argv[])
                t = estrtonum(EARGF(usage()), 0, LLONG_MAX);
                break;
        case 'u':
-               tztime = gmtime;
-               tz = "gm";
+               if (setenv("TZ", "UTC0", 1) < 0)
+                       eprintf("setenv:");
                break;
        default:
                usage();
@@ -39,8 +38,8 @@ main(int argc, char *argv[])
                else
                        fmt = &argv[0][1];
        }
-       if (!(now = tztime(&t)))
-               eprintf("%stime failed\n", tz);
+       if (!(now = localtime(&t)))
+               eprintf("localtime:");
 
        strftime(buf, sizeof(buf), fmt, now);
        puts(buf);