Question: Between the two American bands The Gaslight Anthem and Squirrel Nut Zippers, which band was formed earlier?

full_context: Document 1: Christmas Caravan: Christmas Caravan is a Christmas album by the swing revival band Squirrel Nut Zippers that was released in 1998 by Mammoth Records.
Document 2: Tom Maxwell (singer): Thomas Edward Maxwell (born September 19, 1965) is an American songwriter, musician, vocalist, and writer. Most notably Maxwell is the former lead singer of the swing revival band Squirrel Nut Zippers. He wrote the single "Hell" from the 1996 certified platinum album "Hot".
Document 3: Neil Fallon: Neil Patrick Fallon (October 25, 1971 in Portsmouth, Virginia) is the lead singer and occasional rhythm guitarist, keyboardist and percussionist for the rock band Clutch, and lead singer for The Company Band. He also joined The Bakerton Group on guitar starting with their "El Rojo" album.
Document 4: The Lumineers: The Lumineers are an American folk rock/Americana band based in Denver, Colorado. The founding members are Wesley Schultz (lead vocals, guitar) and Jeremiah Fraites (drums, percussion). Schultz and Fraites began writing and performing together in Ramsey, New Jersey in 2005. Cellist and vocalist Neyla Pekarek joined the band in 2010. The Lumineers emerged as one of the most popular folk rock/Americana artists during the revival of those genres and their growing popularity in the 2010s. The band's stripped back raw sound draws heavily from artists that influenced Schultz and Fraites such as Bruce Springsteen, Bob Dylan and Tom Petty. They are known for their energetic live shows and several international hit singles including "Ho Hey”, “Stubborn Love”, “Ophelia” and “Cleopatra”. The band has become one of the top touring bands in the U.S. and also sells out shows around the world.
Document 5: The Gaslight Anthem: The Gaslight Anthem is an American rock band from New Brunswick, New Jersey, formed in 2006. The band consists of Brian Fallon (lead vocals, rhythm guitar), Alex Rosamilia (lead guitar, backing vocals), Alex Levine (bass guitar, backing vocals), and Benny Horowitz (drums, percussion, backing vocals).
Document 6: List of songs recorded by Brand New: The American rock band Brand New has recorded songs for five studio albums, as well as numerous extended plays and demos. This list comprises the band's song catalog, as well as live renditions, early demo tracks, recorded appearances on other albums, and unreleased tracks that have been discussed by the band. Brand New formed in Long Island, a suburb of New York City in 2000. The group consists of vocalist and guitarist Jesse Lacey, guitarist Vincent Accardi, drummer Brian Lane, and bassist Garrett Tierney. Previous member Derrick Sherman also contributed guitar to a number of the bands releases, whilst producer Mike Sapone has worked with the band throughout their career, and is considered by the band to be a fifth or sixth member.
Document 7: List of Taking Back Sunday band members: Taking Back Sunday is an American rock band from Long Island, New York, formed in 1999 and featuring the current line-up of Adam Lazzara (lead vocals), John Nolan (lead guitar, keyboards, vocals), Eddie Reyes (rhythm guitar), Shaun Cooper (bass guitar), and Mark O'Connell (drums, percussion), accompanied on tour by Nathan Cogan (guitars, keyboards). The group was originally formed by Antonio Longo, John Nolan, Eddie Reyes, Jesse Lacey, and Steven DeJoseph. The band has gone through multiple line-up changes in their career spanning seven studio albums. There have been eleven official members of Taking Back Sunday, four touring members, and twenty-three session members.
Document 8: Roasted Right: Roasted Right is an EP by the swing revival band Squirrel Nut Zippers that was released in 1997. Unlike other albums by the Zippers, brass and woodwinds were replaced by guitars and the blues.
Document 9: Brand New (band): Brand New is an American rock band from Long Island, New York. Formed in 2000, the band consists of Jesse Lacey (vocals, guitar), Vincent Accardi (guitar, vocals), Garrett Tierney (bass guitar, vocals), and Brian Lane (drums, percussion); they are joined by Benjamin Homola (percussion) and Kevin Devine (guitar, vocals) for their live performances. From 2005 until 2013 the band also included Derrick Sherman (guitar, backing vocals, keyboards).
Document 10: Bedlam Ballroom: Bedlam Ballroom is the fifth studio album by the swing revival band Squirrel Nut Zippers, released in 2000. Most editions of the CD case have a lenticular cover. The cover artwork was created by artist Michael Doret.
Document 11: Dave Matthews Band: Dave Matthews Band, also known by the initialism DMB, is an American rock band that was formed in Charlottesville, Virginia in 1991. The founding members were singer-songwriter and guitarist Dave Matthews, bassist Stefan Lessard, drummer and backing vocalist Carter Beauford, and saxophonist LeRoi Moore. Boyd Tinsley joined the band as a violinist soon after the band was formed. Moore died suddenly in August 2008 due to complications from injuries sustained in an ATV accident. Grammy Award winner Jeff Coffin (of Béla Fleck and the Flecktones) has since filled Moore's spot as the band's saxophonist; trumpeter Rashawn Ross and guitarist Tim Reynolds have also become full-time members of the band. Other past members include keyboardists Peter Griesar and Butch Taylor. The group's 2009 album "Big Whiskey & the GrooGrux King", their first after Moore's death, debuted at number one on the "Billboard" 200, earning them their fifth consecutive number-one debut; their most recent album, 2012's "Away from the World", debuted at number one on the Billboard chart, making Dave Matthews Band the first group to have six consecutive studio albums debut in the top spot (Metallica would be the second to do so in 2016). As of 2010, the Dave Matthews Band has sold over 50 million records worldwide.
Document 12: All Time Low: All Time Low is an American rock band from Towson, Maryland, a suburb of Baltimore, formed in 2003. The band currently consists of lead vocalist and rhythm guitarist Alex Gaskarth, lead guitarist and backing vocalist Jack Barakat, bassist and backing vocalist Zack Merrick and drummer Rian Dawson. The band's name is taken from lyrics in the song "Head on Collision" by New Found Glory. The band consistently tours year-long, has headlined numerous tours, and has appeared at music festivals including Warped Tour, Reading and Leeds and Soundwave.
Document 13: Jimbo Mathus: James H. Mathis, Jr. (born August 1967), known as Jimbo Mathus, is an American singer-songwriter and guitarist, best known for his work with the swing revival band Squirrel Nut Zippers.
Document 14: Squirrel Nut Zippers: The Squirrel Nut Zippers is an American swing band formed in 1993 in Chapel Hill, North Carolina, by James "Jimbo" Mathus (vocals and guitar), Tom Maxwell (vocals and guitar), Katharine Whalen (vocals, banjo, ukulele), Chris Phillips (drums), Don Raleigh (bass guitar), and Ken Mosher.
Document 15: Lights Resolve: Lights Resolve is an American alternative rock band that formed in New York City in 2006. The band consists of Matthew Reich (vocals/guitar), Neal Saini (drums), Luke Daniels (bass/vocals) and Ryan Foster (guitar/vocals). "Rolling Stone" has named them a Breakout Band in stating that they encompass "the theatrics and power of Muse mixed with the New York flavor of bands like the Bravery." Lights Resolve has played shows and toured with multi-platinum recording artists such as The Used, Panic! at the Disco, AWOLNATION, Twin Atlantic, We the Kings, J. Cole, Shiny Toy Guns, Dashboard Confessional, Phantom Planet and Straylight Run. In addition, they recently performed at Wilkes University's Spring Concert with We The Kings and Yellowcard. The band has also performed at many festivals including The Bamboozle, SXSW, CMJ, DelunaFest and Warped Tour.
ground_truth: Squirrel Nut Zippers