Android Get Current timestamp?
To obtain the current timestamp, we use System.currentTimeMillis(), specifying milliseconds since Unix epoch.
To render the timestamp in a human-friendly date format, we utilize SimpleDateFormat:
For precision requirements in time-sensitive applications, consider using SystemClock.elapsedRealtime() to ensure robustness and avoid wall clock time issues.
Get timestamp in seconds using Unix time
Access the Unix time, defined as number of seconds that have elapsed since 1970-01-01 00:00:00 UTC, excluding leap seconds.
Quick conversion to Unix time
Dealing with time zones
When working with SimpleDateFormat, it's crucial to account for time zones. Use TimeZone to align timestamps accurately.
Exception handling
While formatting and parsing dates, don't overlook exceptions. Enclose time operations in a try-catch block for stability.
Advanced usage
Tips, tricks, and things to watch out; the timestamp saga continues.
Handling system time changes
Subscribe for Intent broadcasts related to system time changes, and respond suitably to maintain application consistency.
Moving beyond SimpleDateFormat
For thread-safe alternatives, meet java.time.format.DateTimeFormatter from Java 8 Time API - backported to Android.
Using SystemClock.elapsedRealtime()
For measuring intervals or elapsed time, SystemClock.elapsedRealtime() provides a monotonic clock unaffected by wall clock time discrepancies.
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