code: protected TemporalAccessor getFormattableObject(Object value,
              Locale locale, TimeZone timeZone, MustacheTagInfo tagInfo) {
  
          if (value instanceof TemporalAccessor) {
              return (TemporalAccessor) value;
          } else if (value instanceof Date) {
              return LocalDateTime.ofInstant(((Date) value).toInstant(),
                      timeZone.toZoneId());
          } else if (value instanceof Calendar) {
              return LocalDateTime.ofInstant(((Calendar) value).toInstant(),
                      timeZone.toZoneId());
          } else if (value instanceof Number) {
              return LocalDateTime.ofInstant(
                      Instant.ofEpochMilli(((Number) value).longValue()),
                      timeZone.toZoneId());
          } else {
              throw valueNotAFormattableObject(value, tagInfo);
          }
      }
docs: should be safe