# About GNSS XTRA validation check

**URL:** <https://forum.legato.io/t/about-gnss-xtra-validation-check/4009>\
**Category:** Uncategorized\
**Created:** [January 10, 2019, 1:45am UTC](https://forum.legato.io/t/about-gnss-xtra-validation-check/4009 "2019-01-10T01:45:41Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Park](https://avatars.discourse-cdn.com/v4/letter/p/e79b87/32.png) [@Park](https://forum.legato.io/u/Park)\
**Post date:** [January 10, 2019, 1:45am UTC](https://forum.legato.io/t/about-gnss-xtra-validation-check/4009/1 "2019-01-10T01:45:41Z")

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In xtraTest.c file,

```
LE_ASSERT(le_gnss_GetExtendedEphemerisValidity(&start,&stop) == LE_OK);
....
/* Check validity duration of injected XTRA file (7 days) */
validity = stop-start;
LE_ASSERT(validity/SECONDS_IN_A_DAY == 7);

```

Q. Is it valid if the value of “validity/SECONDS\_IN\_A\_DAY” is 7??  
Otherwise, others are invalid. Am I right?

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<div class="post-metadata">

**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\
**Post date:** [January 10, 2019, 2:35am UTC](https://forum.legato.io/t/about-gnss-xtra-validation-check/4009/2 "2019-01-10T02:35:32Z")

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The Xtra file validity is equal to 7 days.