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core: add helper functions to format / parse timestamps

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To save datetime-based filter constraints to git or XML,
it is preferrable to use human-readable representations.
Therefore, add helper functions to format / parse timestamp_t
64-bit values in the "YYYY-MM-DD hh:mm:ss" format.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2020-08-27 07:10:33 +02:00 • committed by Dirk Hohndel
parent f9721fce4b
commit 8f898477cb
2 changed files with 54 additions and 0 deletions
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4
core/subsurface-time.h
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@ -14,6 +14,10 @@ extern void utc_mkdate(timestamp_t, struct tm *tm);
extern int utc_year(timestamp_t timestamp);
extern int utc_weekday(timestamp_t timestamp);
/* parse and format date times of the form YYYY-MM-DD hh:mm:ss */
extern timestamp_t parse_datetime(const char *s); /* returns 0 on error */
extern char *format_datetime(timestamp_t timestamp); /* ownership of string passed to caller */
#ifdef __cplusplus
}
#endif