gistfile1.txt

if( ISBLANK(Phone),"--",
 
if( CONTAINS("206:209:213:253:310:323:360:408:415:425:503:509:510:530:559:562:604:619:626:650:661:702:707:714:760:775:778:805:818:831:858:867:909:916:925:949:951:971:236:250:604:778:867", left(SUBSTITUTE( Phone , "(", ""),3)),"UTC-8 Pacific",
 
if(
CONTAINS("208:250:303:307:385403:406:435:480:505:520:602:623:719:720:780:801:928:970:403:587:780", left(SUBSTITUTE( Phone , "(", ""),3)),"UTC-7 Mountain",
 
if(
CONTAINS("204:205:210:214:217:218:224:225:228:251:254:256:262:270:281:306:308:309:312:314:316:318:319:320:325:334:337:361:402:405:409:414:417:430:432:469:479:501:504:507:512:515:563:573:580:601:605:608:612:615:618:620:630:636:641:651:660:662:682:708:712:713:715:731:763:769:773:785:806:815:816:817:830:832:847:901:903:913:915:918:920:931:936:940:952:956:972:979:985:204:306:431:639:807", left(SUBSTITUTE( Phone , "(", ""),3)),"UTC-6 Central",
 
if(
CONTAINS("201:202:203:207:212:215:216:219:226:229:231:234:239:240:248:252:267:269:276:289:301:302:304:305:313:315:321:330:336:339:345:347:351:352:386:404:407:410:412:416:418:419:434:438:440:443:450:470:475:478:484:502:508:513:514:516:517:518:519:540:551:561:567:570:571:585:586:603:606:607:609:610:613:614:616:617:631:646:647:649:678:703:704:705:706:716:717:718:724:727:732:734:740:754:757:770:772:774:781:786:802:803:804:810:813:814:819:828:835:843:845:848:856:857:859:860:862:863:864:865:876:878:904:905:908:910:912:914:917:919:937:941:947:954:959:973:978:980:226:249:289:343:365:416:437:438:450:514:519:579:581:613:647:705:819:873:905", left(SUBSTITUTE( Phone , "(", ""),3)),"UTC-5 Eastern",
 
if(
CONTAINS("506:709:902",LEFT(SUBSTITUTE(Phone,"(",""),3)),"UTC-4 Atlantic",
 
if(
CONTAINS("800:877",LEFT(SUBSTITUTE(Phone,"(",""),3)),"Toll Free","Other"
 
)))))))