NTP method to get a string from any unix timestamp

code/espurna/config/general.h

@@ -1115,7 +1115,6 @@ PROGMEM const char* const custom_reset_string[] = {
 #define NTP_DST_REGION          0               // 0 for Europe, 1 for USA (defined in NtpClientLib)
 #endif
 
-
 // -----------------------------------------------------------------------------
 // ALEXA
 // -----------------------------------------------------------------------------

code/espurna/ntp.ino

@@ -129,10 +129,8 @@ bool ntpSynced() {
     return (year() > 2017);
 }
 
-String ntpDateTime() {
-    if (!ntpSynced()) return String();
+String ntpDateTime(time_t t) {
     char buffer[20];
-    time_t t = now();
     snprintf_P(buffer, sizeof(buffer),
         PSTR("%04d-%02d-%02d %02d:%02d:%02d"),
         year(t), month(t), day(t), hour(t), minute(t), second(t)
@@ -140,6 +138,11 @@ String ntpDateTime() {
     return String(buffer);
 }
 
+String ntpDateTime() {
+    if (ntpSynced()) return ntpDateTime(now());
+    return String();
+}
+
 // -----------------------------------------------------------------------------
 
 void ntpSetup() {