+
+//! Convert the time structure into a string of form 'Sun Sep 16 01:03:52 1973\n\0'
+char *asctime(const struct tm *timeptr)
+{
+ static char staticbuf[sizeof("Sun Sep 16 01:03:52 1973\n")];
+ return asctime_r(timeptr, staticbuf);
+}
+char *asctime_r(const struct tm *timeptr, char *buf)
+{
+ const char *WDAYS[] = {"Sun","Mon","Tue","Wed","Thu","Fri","Sat","Sun"};
+ const char *MONS[] = {"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};
+ sprintf(buf,
+ "%s %s %i %02i:%02i:%02i %4i\n",
+ WDAYS[timeptr->tm_wday],
+ MONS[timeptr->tm_mon],
+ timeptr->tm_mday,
+ timeptr->tm_hour,
+ timeptr->tm_min,
+ timeptr->tm_sec,
+ timeptr->tm_year
+ );
+ return buf;
+}
+
+//! asctime(localtime(timer))
+char *ctime(const time_t *timer)
+{
+ struct tm time_buf;
+ localtime_r(timer, &time_buf);
+ return asctime(&time_buf);
+}
+extern char *ctime_r(const time_t *timer, char *buf)
+{
+ struct tm time_buf;
+ localtime_r(timer, &time_buf);
+ return asctime_r(&time_buf, buf);
+}
+
+//! Convert \a timter into UTC
+struct tm *gmtime(const time_t *timer)
+{
+ // Ignore UTC
+ return localtime(timer);
+}
+struct tm *gmtime_r(const time_t *timer, struct tm *result)
+{
+ return localtime_r(timer, result);
+}
+
+static struct tm static_tm;
+
+struct tm *localtime(const time_t *timer)
+{
+ return localtime_r(timer, &static_tm);
+
+}
+struct tm *localtime_r(const time_t *timer, struct tm *ret)
+{
+ // Hours, Mins, Seconds
+ int64_t days = get_days_since_y2k(*timer, &ret->tm_hour, &ret->tm_min, &ret->tm_sec);
+
+ // Week day
+ ret->tm_wday = (days + 6) % 7; // Sun = 0, 1 Jan 2000 was Sat (6)
+
+ // Year and Day of Year
+ bool is_ly;
+ ret->tm_year = 2000 + get_years_since_y2k(days, &is_ly, &ret->tm_yday);
+
+ // Month and Day of Month
+ get_month_day(ret->tm_yday, is_ly, &ret->tm_mon, &ret->tm_mday);
+ ret->tm_mon --;
+
+ ret->tm_isdst = 0; // Fuck DST
+
+ return ret;
+}
+
+static inline size_t MIN(size_t a, size_t b) { return a < b ? a : b; }
+static size_t _puts(char * restrict s, size_t maxsize, size_t ofs, const char *str, size_t len)
+{
+ if( s && ofs < maxsize ) {
+ size_t addlen = MIN(len, maxsize-1-ofs);
+ memcpy(s+ofs, str, addlen);
+ }
+ return len;
+}
+
+size_t strftime(char*restrict s, size_t maxsize, const char*restrict format, const struct tm*restrict timeptr)
+{
+ size_t ofs = 0;
+
+ while( *format )
+ {
+ const char *restrict start = format;
+ while( *format && *format != '%' )
+ format ++;
+ if( format != start )
+ ofs += _puts(s, maxsize, ofs, start, format-start);
+ if( *format == 0 )
+ break;
+ format ++;
+ switch(*format++)
+ {
+ case 0: format--; break;
+ case '%': ofs += _puts(s, maxsize, ofs, format-1, 1); break;
+ case 'd': // The day of the month as a decimal number (range 01 to 31).
+ {
+ char tmp[2] = {'0','0'};
+ tmp[0] += (timeptr->tm_mday / 10) % 10;
+ tmp[1] += timeptr->tm_mday % 10;
+ ofs += _puts(s, maxsize, ofs, tmp, 2);
+ }
+ break;
+ default:
+ _SysDebug("TODO: strftime('...%%%c...')", format[-1]);
+ break;
+ }
+ }
+
+ return ofs;
+}