Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
List of Chief Ministers of Nagaland
Table title:
List
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > No </th><th colspan=1 rowspan=1 > Name </th><th colspan=2 rowspan=1 > Term of office </th><th colspan=2 rowspan=1 > Party </th><th colspan=1 rowspan=1 > Days in office </th></tr>
<tr> <td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > P. Shilu Ao MLA for Impur </td><td colspan=1 rowspan=1 > 1 December 1963 </td><td colspan=1 rowspan=1 > 14 August 1966 </td><td colspan=1 rowspan=3 > Naga Nationalist Organisation </td><td colspan=1 rowspan=3 >  </td><td colspan=1 rowspan=1 > 987 days </td></tr>
<tr> <td colspan=1 rowspan=1 > 2 </td><td colspan=1 rowspan=1 > T. N. Angami MLA for Western Angami </td><td colspan=1 rowspan=1 > 14 August 1966 </td><td colspan=1 rowspan=1 > 22 February 1969 </td><td colspan=1 rowspan=1 > 924 days </td></tr>
<tr> <td colspan=1 rowspan=1 > 3 </td><td colspan=1 rowspan=1 > Hokishe Sema MLA for Akuluto </td><td colspan=1 rowspan=1 > 22 February 1969 </td><td colspan=1 rowspan=1 > 26 February 1974 </td><td colspan=1 rowspan=1 > 1831 days </td></tr>
<tr> <td colspan=1 rowspan=1 > 4 </td><td colspan=1 rowspan=1 > Vizol Angami MLA for Southern Angami-II </td><td colspan=1 rowspan=1 > 26 February 1974 </td><td colspan=1 rowspan=1 > 10 March 1975 </td><td colspan=1 rowspan=1 > United Democratic Front </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 378 days </td></tr>
<tr> <td colspan=1 rowspan=1 > 5 </td><td colspan=1 rowspan=1 > John Bosco Jasokie MLA for Kohima Town </td><td colspan=1 rowspan=1 > 10 March 1975 </td><td colspan=1 rowspan=1 > 20 March 1975 </td><td colspan=1 rowspan=1 > Naga National Democratic Party </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 11 days </td></tr>
<tr> <td colspan=1 rowspan=1 > – </td><td colspan=1 rowspan=1 > Vacant (President's rule) </td><td colspan=1 rowspan=1 > 20 March 1975 </td><td colspan=1 rowspan=1 > 25 November 1977 </td><td colspan=1 rowspan=1 > N/A </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > (4) </td><td colspan=1 rowspan=1 > Vizol Angami MLA for Southern Angami-II </td><td colspan=1 rowspan=1 > 25 November 1977 </td><td colspan=1 rowspan=1 > 18 April 1980 </td><td colspan=1 rowspan=1 > United Democratic Front </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 876 days [Total 1254 days] </td></tr>
<tr> <td colspan=1 rowspan=1 > 6 </td><td colspan=1 rowspan=1 > S. C. Jamir MLA for Aonglenden </td><td colspan=1 rowspan=1 > 18 April 1980 </td><td colspan=1 rowspan=1 > 5 June 1980 </td><td colspan=1 rowspan=1 > United Democratic Front—Progressive </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 49 days </td></tr>
<tr> <td colspan=1 rowspan=1 > (5) </td><td colspan=1 rowspan=1 > John Bosco Jasokie MLA for Kohima Town </td><td colspan=1 rowspan=1 > 5 June 1980 </td><td colspan=1 rowspan=1 > 18 November 1982 </td><td colspan=1 rowspan=1 > Naga National Democratic Party </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 897 days [Total 908 days] </td></tr>
<tr> <td colspan=1 rowspan=1 > (6) </td><td colspan=1 rowspan=1 > S. C. Jamir MLA for Aonglenden </td><td colspan=1 rowspan=1 > 18 November 1982 </td><td colspan=1 rowspan=1 > 28 October 1986 </td><td colspan=1 rowspan=1 > United Democratic Front—Progressive </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1440 days </td></tr>
<tr> <td colspan=1 rowspan=1 > (3) </td><td colspan=1 rowspan=1 > Hokishe Sema </td><td colspan=1 rowspan=1 > 29 October 1986 </td><td colspan=1 rowspan=1 > 7 August 1988 </td><td colspan=1 rowspan=1 > Indian National Congress </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 648 days [Total 2479 days] </td></tr>
<tr> <td colspan=1 rowspan=1 > – </td><td colspan=1 rowspan=1 > Vacant (President's rule) </td><td colspan=1 rowspan=1 > 7 August 1988 </td><td colspan=1 rowspan=1 > 25 January 1989 </td><td colspan=1 rowspan=1 > N/A </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > (6) </td><td colspan=1 rowspan=1 > S. C. Jamir MLA for Mokokchung Town </td><td colspan=1 rowspan=1 > 25 January 1989 </td><td colspan=1 rowspan=1 > 10 May 1990 </td><td colspan=1 rowspan=1 > Indian National Congress </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 471 days </td></tr>
<tr> <td colspan=1 rowspan=1 > 7 </td><td colspan=1 rowspan=1 > K. L. Chishi MLA for Atoizu </td><td colspan=1 rowspan=1 > 16 May 1990 </td><td colspan=1 rowspan=1 > 19 June 1990 </td><td colspan=1 rowspan=1 > Indian National Congress </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 36 days </td></tr>
<tr> <td colspan=1 rowspan=1 > 8 </td><td colspan=1 rowspan=1 > Vamuzo Phesao </td><td colspan=1 rowspan=1 > 19 June 1990 </td><td colspan=1 rowspan=1 > 2 April 1992 </td><td colspan=1 rowspan=1 > Nagaland People's Council </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 653 days </td></tr>
<tr> <td colspan=1 rowspan=1 > – </td><td colspan=1 rowspan=1 > Vacant (President's rule) </td><td colspan=1 rowspan=1 > 2 April 1992 </td><td colspan=1 rowspan=1 > 22 February 1993 </td><td colspan=1 rowspan=1 > N/A </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > (6) </td><td colspan=1 rowspan=1 > S. C. Jamir MLA for Aonglenden </td><td colspan=1 rowspan=1 > 22 February 1993 </td><td colspan=1 rowspan=1 > 6 March 2003 </td><td colspan=1 rowspan=1 > Indian National Congress </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 3665 days [Total 5625 days] </td></tr>
<tr> <td colspan=1 rowspan=1 > 9 </td><td colspan=1 rowspan=1 > Neiphiu Rio MLA for Northern Angami-II </td><td colspan=1 rowspan=1 > 6 March 2003 </td><td colspan=1 rowspan=1 > 3 January 2008 </td><td colspan=1 rowspan=1 > Nagaland People's Front </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1767 days </td></tr>
<tr> <td colspan=1 rowspan=1 > – </td><td colspan=1 rowspan=1 > Vacant (President's rule) </td><td colspan=1 rowspan=1 > 3 January 2008 </td><td colspan=1 rowspan=1 > 12 March 2008 </td><td colspan=1 rowspan=1 > N/A </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > (9) </td><td colspan=1 rowspan=1 > Neiphiu Rio MLA for Northern Angami-II </td><td colspan=1 rowspan=1 > 12 March 2008 </td><td colspan=1 rowspan=1 > 24 May 2014 </td><td colspan=1 rowspan=4 > Nagaland People's Front </td><td colspan=1 rowspan=4 >  </td><td colspan=1 rowspan=1 > 2264 </td></tr>
<tr> <td colspan=1 rowspan=1 > 10 </td><td class="highlighted"  colspan=1 rowspan=1 > T. R. Zeliang MLA for Peren </td><td class="highlighted"  colspan=1 rowspan=1 > 24 May 2014 </td><td class="highlighted"  colspan=1 rowspan=1 > 22 February 2017 </td><td colspan=1 rowspan=1 > 1005 </td></tr>
<tr> <td colspan=1 rowspan=1 > 11 </td><td colspan=1 rowspan=1 > Shurhozelie Liezietsu </td><td colspan=1 rowspan=1 > 22 February 2017 </td><td colspan=1 rowspan=1 > 19 July 2017 </td><td colspan=1 rowspan=1 > 147 </td></tr>
<tr> <td colspan=1 rowspan=1 > (10) </td><td class="highlighted"  colspan=1 rowspan=1 > T. R. Zeliang MLA for Peren </td><td class="highlighted"  colspan=1 rowspan=1 > 19 July 2017 </td><td class="highlighted"  colspan=1 rowspan=1 > 8 March 2018 </td><td colspan=1 rowspan=1 > 232 [Total 1237 days] </td></tr>
<tr> <td colspan=1 rowspan=1 > (9) </td><td colspan=1 rowspan=1 > Neiphiu Rio MLA for Northern Angami-II </td><td colspan=1 rowspan=1 > 8 March 2018 </td><td colspan=1 rowspan=1 > Incumbent </td><td colspan=1 rowspan=1 > Nationalist Democratic Progressive Party </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 418 </td></tr>
</table>
Question:
When did T. R. Zeliang serve as the Chief Minister of Nagaland?
Answer:
T. R. Zeliang twice served as the Chief Minister of Nagaland, first from May 2014 to February 2017 and then from July 2017 to March 2018.